Windows 8 and 8.1 Forums

CPU Red Light

  1. #1


    Norway
    Posts : 6
    Windows 8 Pro 64-Bit

    CPU Red Light


    Specs:
    Motherboard: Asus M5A99X Evo
    CPU: AMD FX-6200 & AMD Athlon 2X
    GPU: Asus Radeon HD 7870 DCUII
    PSU: OCZ ModXStream Pro 700W
    RAM: Corsair Vengance 4GBX2 1600MHz
    SSD/HDD: OCZ Agility 3 120GB & Seagate Barracuda 3TB

    So I bought a new HDD (3TB) and a new chassis (Fractal Design R4) for my about 1 year old system. Everything was working fine untill I came home from school and I had left the system on, and the screen was black (This was three days after I changed the new parts). I tried to reset by the reset button, but it didn't work, so I turned off the Power Supply and back on. But I didn't get a post screen. The CPU led on the mobo was lighting red. I assumed the CPU had died, since I OC'ed it when it was already factory OC'd. So I tried my friends Athlon X2 CPU, but it still wouldn't boot and the CPU led was still red. Is the problem my motherboard?

      My System SpecsSystem Spec

  2. #2


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    1. Double check all the cables: power, sata etc...
    2. Do you have anything to test the PSU ? if not, try another PSU
    3. To make sure there's no short, you can try to take the MB out of the case and boot up from there with the OS HD only
      My System SpecsSystem Spec

  3. #3


    Norway
    Posts : 6
    Windows 8 Pro 64-Bit


    @topgundcp
    I've checked the cables, and anyway it worked fine earlier that day (without changing anything on the cables), the PSU should be fine because the fans are all running ok, and why would it help to take the motherboard out of the case and try to boot up the Drive with the OS if I get no post-screen?
      My System SpecsSystem Spec

  4. #4


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    This is part of isolation the problem to make sure your MB is not shorted somewhere inside the case.
      My System SpecsSystem Spec

  5. #5


    Norway
    Posts : 6
    Windows 8 Pro 64-Bit


    Can you describe what you mean by "shorted"?
      My System SpecsSystem Spec

  6. #6


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    Quote Originally Posted by nickcs View Post
    Can you describe what you mean by "shorted"?
    grounded with the case.
      My System SpecsSystem Spec

  7. #7


    Posts : 467
    Windows 8 Pro


    what does your mobo manual say about the error light, is it constant or flashing?
      My System SpecsSystem Spec

  8. #8


    Norway
    Posts : 6
    Windows 8 Pro 64-Bit


    @wullaill
    It's constantly flashing. I'll check the manual when I come home.
      My System SpecsSystem Spec

  9. #9


    Norway
    Posts : 6
    Windows 8 Pro 64-Bit


    Problem solved. I don't what I did. I just started messing around with the components, and I touched some of the cables because they were in the way, and all of a sudden the CPU red light goes off, and the system boots normally. I'm very happy, but still very frustrating to not know what the problem was.
      My System SpecsSystem Spec

  10. #10


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    I am glad you got it working and back to my suggestion: you got a short somewhere in the case and you should take a close look of everything and re-organize all cables.
      My System SpecsSystem Spec

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