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Thread: Pc power problem




  1. #1
    rclark is offline Member
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    Default Pc power problem

    Hey everyone,
    My pc was working fine last night and then this morning---nothing !!! Pushed the power switch and nothing happened except my heart stopped---ha !!!
    The only sign of life is the "clear bios" light on the back is on. I have checked the electrical socket, the power chord and all the connections on the inside of the pc and they are all tight.
    Could it be the case power switch problem or should I start looking at other things as well---never had one just go blank like this. I'll continue looking into the case power switch, I just thought I would ask for any suggestions on how to troubleshoot something like this.
    Thanks---rclark

  2. #2
    rclark is offline Member
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    Default Re: Pc power problem

    Just tried a new Corsair 850 TX psu--still same--nothing happens--no motherboard lights, just the clear cmos light on back stays lit and LCD monitor amber light does come on also. Afraid this is starting to look like a motherboard issue ??
    thanks again for any advice--rclark
    -------------------------------------------------EDIT-----------------------------------
    Also unplugged all drives and fans and cpu to see if motherboard would power up and it does not. Also did check the power switch for conductivity and it was fine -----Appears something with the motherboard, however I am very inexperienced with troubleshooting this stuff--thus the post---ha !!!!
    ---rclark-----

    _____________________________________EDIT_________ _____________________

    Well in checking my S/N for motherboard my 3 years expires 10/14/2013. Sent in ticket to techs for possible RMA for this board.
    Last edited by rclark; 08-20-2013 at 11:23 AM.

  3. #3
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    Default Re: Pc power problem

    Problems, problems, problems, always problems.

    Remove the motherboard from the computer case, and place the motherboard on a cardboard box, beside the case.
    Disconnect both RESET wires to eliminate this as a possible problem.
    You can disconnect both POWER wires from the front panel header and carefully jumper both pins to start your system.
    Try booting with a minimal hardware setup and see if your system can boot into the bios.
    I assume that you have a case speaker connected to the front panel header.
    Inspect the 24-pin and 8-pin power cable ends and the associated motherboard sockets for any signs of damage or burnt connectors.
    Can you test with a different video card?

    Make sure that the Clear CMOS switch is not stuck.
    Have you made any recent hardware changes to your system?
    Q9650 @ 4.10GHz [9x456MHz]
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    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
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  4. #4
    rclark is offline Member
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    Default Re: Pc power problem

    Hey Professor !!!! Well, this is the best part of when I have to come here with my tail tucked and expose my ignorance---I get to visit with you and the gang again--- ( please no more exams---ha !!!!! )
    Before I get to business--- How have you been doing ? I am sitting here with a cup of coffee and when I saw you had replied I thought to myself---the cavalry has arrivIed. In regards to any new hardware, no, the only thing rather new ( a few months back I hooked up a new flight sim hotas that I have been running off a self powered usb hub off one of the 2.0 usb ports on the motherboard ( trying to save pc energy---ha !! ). I will try the other recommendations which are really good ones--didn't think of just trying to boot from the power post and also I guess by taking the board out of the case rules out any contact with the case by the bottom of the motherboard that could be shorting something.
    Right now I gotta get out and do some work but will get on this as soon as I get home.
    Thanks so much for the help !!! Thus begins another educational adventure with Profjim--gotta love it !! --Robby--
    Last edited by rclark; 08-20-2013 at 09:03 PM.

  5. #5
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    Default Re: Pc power problem

    As part of the minimal hardware configuration, disconnect all unneeded usb devices and hubs.
    You might need to also disconnect the the usb front panel cable to ensure that none of the devices or cables are causing the boot problem.
    I've seen a few cases where the RESET switch or a usb connection caused boot problems.

    Now that you mention it, maybe it's time for another exam.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


  6. #6
    rclark is offline Member
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    Default Re: Pc power problem

    Man, sorry for taking so long on this Professor !!! Real life is really absorbing my time------ dangit !!! Well, here is the scoop, don't know if this is good or bad--hoping for good--ha !! Got everything out of the pc, less the cpu and the psu, all usb hub connectors disconnected and reset switch as well disconnected, jumping in before taking out the motherboard I decided to check and see if anything happened with the board in the case and when I hit the power switch--wow--activity--lights--looked like a Christmas setting--ha !!! Started plugging all usb hub wires in and the reset wire, put in the memory and tried and it started up fine.
    So, for tomorrow, what are your recommendations --continue plugging stuff in and trying or put everything back together and try. One thing I did notice is there is a pretty nice scratch on my Corsair H50 cpu cooler, it is bad enough to feel and I am wondering if I should replace this . I am not sure if the thermal grease is sufficient for irregularities like this, what do you recommend ? I also noticed that the reset wire had been pulled somehow and the positive wire was very loose when I was taking these out---hmmmm !!!
    Well that is about it, I'll leave things be until I hear from you, oh yes I saw the comment regarding another exam---education always comes with a price in some ways----ha!!!!
    Thanks so much profJim. ---Robby---

  7. #7
    profJim's Avatar
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    Default Re: Pc power problem

    Glad to see that you're making progress.
    It makes sense that your motherboard won't power up if there was a short circuit in the RESET switch or it's wires or if something else was shorting both of the RESET front panel pins. I've also seen where an improperly installed usb 3.0 cable prevented a newer motherboard from powering up. Bad connections cause many problems when electrical wires or connections aren't secure or if hardware isn't properly seated in their motherboard slots.

    Your system might be fine if you reconnect everything and test.
    Normally I would suggest that you only reconnect one or two items, retest and then reconnect one or two items until everything is connected and your system proves to be stable.

    I assume that the scratch you described is on the bottom copper surface of your water pump. You might be able to get by if you fill the scratch with thermal grease (TIM) so that there isn't a pocket of trapped air. You might be able to reduce the size of the scratch by using several grades of wet/dry sandpaper, starting with 400 grit then 600 grit followed by 800 or 1000 grit where the sandpaper is taped to a flat pane of glass and you use a circular motion with the copper surface on wet sandpaper. A web search using: lapping cpu wet/dry sandpaper will provide instructions and videos. Don't carry this to an extreme, about 30 minutes of total time with the various grits should be enough.

    Why is your detailed hardware list missing from your PC Specs list?
    If we don't see your hardware list in the PC Specs by 9:00 A.M. (PDT), you'll be in deep doo-doo; I'll put a curse on both of your power supplies.
    Last edited by profJim; 08-21-2013 at 07:55 PM. Reason: typo
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


  8. #8
    rclark is offline Member
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    Default Re: Pc power problem

    Good grief --sorry about not having my specs shown Professor, they use to be there, oh well, I entered them where they should go---sorry about that !!! Please have pity on me, no more CURSES ---ha !!!! ----
    I may do the lapping to minimize the scratch on this Corsair H50. It is not the easiest thing to install for me,if I had a bigger case I believe I would go with a conventional air cooled cpu cooler.
    Well, better get out and do some work, thanks again as always for your great help profJim!!!! --Robby--
    Last edited by rclark; 08-22-2013 at 02:24 AM.

  9. #9
    rclark is offline Member
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    Default Re: Pc power problem

    Well, pc is up and running----still scratching my head on this--who knows for sure, and my question is can you ever find out what most likely causes these things to occur. This is the toughest thing with me and computers, I like to have a definitive reason things happen, and in knowing what did cause the problem you can fix it and know you resolved the part that caused the skadoo. Oh well, I am getting better in putting things in a cramped case--I really wish I could afford a full size case --ha !!! ProfJim, I did lap the Corsair H50 to get rid of the scratch, used 800 grit wet and dry sandpaper, then 1000,1500,2500---man that thing is like a mirror ( used a little water for sanding also ). Temps are now 10c at idle and 26c under 100 % full Prime 95 load----NOT ( BUT I WISH !!! ) -----Temps are actually pretty much still the same ( @ 35C idle and 68C under Prime 95 full load @ 3.6 ghz ) ---
    ProfJim, again your recommendations were right on and I cannot thank you enough for your help and support ---I will be waiting for the upcoming exam with great anticipation!!!!!
    take care---Robby---
    Last edited by rclark; 08-22-2013 at 10:06 AM.

  10. #10
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    Cool Re: Pc power problem

    In a perfect world there would always be a simple reason why things suddenly fail.
    We live in an imperfect world so my explanation is also imperfect.

    Other than an outright hardware failure, most computer problems are caused by connection problems related to wiring or hardware connections. Our systems go through many heating and cooling cycles and this can lead to failed hardware connections. I thoroughly clean the inside of my computer case 2 or 3 times a year, where I first disconnect my power supply from the wall outlet and then remove and reinstall all attached wires, cables and hardware, except for the cpu and cpu heatsink. I double check that the cpu cooler is still firmly attached.

    You should also inspect all wires and cables to make sure that there are no bare spots or unused power supply cable ends that can cause a short circuit by grounding to any part of the computer case or installed hardware.

    Here's your exam:
    Explain in detail how and why computer systems can fail.
    Minimum essay length: 20,480 words
    Maximum essay length: 2TB
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


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