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Thread: B75M-ITX Will Not Power UP

  1. #1
    pfddi is offline Junior Member
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    Default B75M-ITX Will Not Power UP

    I just purchased a B75M-ITX MB and have the following components:
    Intel i7 -3770 CPU
    Kingston KHX16c10B1R2 Memory (2 x 8)
    Samsung SSD 840 PRO

    I cannot get the MB to come alive. CPU fan starts but I get no POST beeps or any sound and of course the VGA does not show anything. I rest the CMOS and then took the MB out of the case and tried to boot the MB with just the CPU fan and the HD Audio connected - still no luck. Now, I have a 20 pin Power connector on the power supply I have that will only work with the additional 4 pin 12v connector plugged into it, leaving the 4 pin 12v connector empty. No where can I find any documentation as to what the correct configuration is for the power to properly run the MB. The manual states that the MB will operate with a 20 pin power connector, but that configuration with the 4 pin 12v plugged in (#19) does not even start the CPU fan. Any thoughts. I have tried the MB with 2 different cases with the same resut. One had a 600w power supply, the other a 250w (again no manual on what the minimum wattage should me...)

  2. #2
    profJim's Avatar
    profJim is online now Chief Munchkin + moderator
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    Default Re: B75M-ITX Will Not Power UP

    You must connect the power supply's ATX_12V cable to the individual 4-pin connector (#19) on the motherboard.
    If you have a 20-pin + 4-pin main power supply cable, do not attempt to connect this 4-pin cable to the #19 connector.
    The correct ATX_12V power cable will have 2 black wires and 2 yellow wires at the connector.
    See the attached chart for the standard wire colors for each of the 4-pin connectors.
    You will need at least one memory module installed in the correct slot for your system to post and boot.

    Looking at the 196 page quick installation guide, I did not see a case speaker connector on the motherboard so you won't hear any beep error codes unless your motherboard has a built-in speaker already attached.

    Post the model numbers for each of your power supplies and links to the specifications for each psu.
    If you are using power supplies that are too old, this might be part of the problem.
    A good quality 300 watt (or higher) psu should be fine.

    Test your motherboard with it resting on a cardboard box beside your computer case.
    Do NOT connect the RESET switch to the motherboard until your system is able to boot.
    A faulty (always ON or shorted) RESET switch will prevent your system from booting.

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    Q9650 @ 3.80GHz [9x422MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 844MHz @4-4-4-10
    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
    .


  3. #3
    pfddi is offline Junior Member
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    Thumbs up Re: B75M-ITX Will Not Power UP

    Thank you for your complete and correct response! I was told by Support to remove everything and try and listen for the POST beeps, but with only an HD Audio connection, I get no sound during the POST process. After taking the mobo out of the case and inserting a memory stick in Bank 0, the system came alive. Thanks for the description of the power cables as it has been a while since I built a system up from scratch - very thorough and complete!

  4. #4
    profJim's Avatar
    profJim is online now Chief Munchkin + moderator
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    Default Re: B75M-ITX Will Not Power UP

    You're welcome, glad to help out.
    Have you tried booting with the motherboard secured inside of the computer case?
    Sometimes there can be a short circuit with the motherboard in the computer case.
    This can be due to a problem in the rear I/O panel area if the computer case's I/O opening is not correctly formed and part of the case opening sticks out too far on the inside. Make sure that all of the motherboard standoffs are properly aligned with the mounting holes in the motherboard.
    Last edited by profJim; 05-01-2013 at 10:18 PM.
    Q9650 @ 3.80GHz [9x422MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 844MHz @4-4-4-10
    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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