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Thread: How to determine if its the CPU that fails?

  1. #1

    Default How to determine if its the CPU that fails?

    Hello everyone

    My system is a core i7 920 CO/C1 and I have a Gigabyte UD4P motherboard, with 6 GB ram.

    I have a huge problem... my PC will not boot. I bought a Thermalright IFX-14, just to see if I could shave off a couple of degrees while overclocking. I guess somehow something went wrong.

    I installed it, despite I did not think that the backplate, bracket and mounting plate were securing it well enough. I was not even able to tighten the spring loaded screws hard enough to avoid any heatsink movement.

    But that is not the problem anyway. What I would like to know is how do I determine if my CPU has died on me?

    When I power up everything works as supposed except the system does not boot. All fans, motherboard and graphics card lights up and it really sounds like its booting up - but no. I can hear the motherboard beep once and it sounds like it normally does, but my screen reamains blank.

    What leads me to think its the CPU that has died, is the fact that if I connect the power connector of the CPU cooler fan to the CPU fan header instead of the system fan, the fan will not run. It will run in the sys_fan but not the CPU_fan. Does that mean it is my CPU that is dead?

    I really need some help here...thanks.


  2. #2

    Default Re: How to determine if its the CPU that fails?

    I forgot to tell that I checked to see if the CPU had any pins bend, but i do not think it has any. I even reinstalled the old CPU cooler to see if that would help but no.

    I remember the 1st time when I first build my system it would not boot at first back then - it actually took some time to get it to do that. I have no idea why back then and I still donīt. Could it just be something similar again or will I have to go out and buy a new CPU?

  3. #3
    Join Date
    Apr 2009

    Default Re: How to determine if its the CPU that fails?

    Hi Grnkjro
    You could be getting a short from the case. We recommend you remove that motherboard from the case/chassis and test the board for POST. Please follow the following simple steps.
    1. Place the motherboard on top of the cardboard box (you can use the motherboard box)
    2. Install the CPU, CPU fan, Memory, Power supply plugs (plug the 1 X 20 pin and 1 X 4 or 2 X 8 pin from the power supply unit) and a video card.
    3. Hook the monitor to the video card and be sure the monitor is switched on.
    4. Turn on the system board by using the case "Power on" switch.
    If the system fails to POST, check the components' insertion again to ensure they are all connected properly.
    Last edited by artdrivers; 07-22-2009 at 03:04 AM.
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  4. #4

    Default Re: How to determine if its the CPU that fails?

    I solved the problem.

    It turned out that because I had reinstalled everything I needed to remove 2 sticks of RAM and have it boot up using only one modul.

    I think it was something similar when I first build the system.

    A lot of people will surely be sending back things if they run into a similar problem.

    Thanks for the suggestions.. it is always nice to know that people in here will be there when your in need.


  5. #5
    Join Date
    Apr 2009
    J'Habite En Angleterre

    Default Re: How to determine if its the CPU that fails?

    If you encounter the issue again, a CMOS clear may help. When you removed two sticks of RAM, the board was forced to amend it's details for installed components. Clearing the CMOS will force a cpmplete re-detection.

    Glad you got it sorted out. I was about to suggest the exact same steps as artdrivers, with the addition of seperating the HSF back plate from the back of the board with a piece of paper (with holes where the screws hold HSF to bracket).
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  6. #6

    Default Re: How to determine if its the CPU that fails?

    Sadly enough I am only able to use 1 stick of RAM in the 1st slot. It will not boot with 2 or 3 sticks - strange.

    I know that I need to clear CMOS when I installed this - that is not the issue here. It actually does it on its own when it runs for like 30 sec if I set everything in BIOS as supposed and then shut down and install the other 2 sticks.

    Perhaps something really is bend in my CPU - that prevents me from running 3 sticks - has that been heard of before?

    Removing battery and trying other RAM sticks does not help any.


  7. #7

    Default Re: How to determine if its the CPU that fails?

    Hey again

    Now I know something strange is going on, because right now I am running triple channel with 3 stick but not in the right slots.

    1st stick is in the first white slot (DDR3_1)
    2nd stick in the blue slot (DDR3_4)
    3rd stick in the blue slot (DDR3_6)

    Now what has happend here - any suggestions?


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