PC powers up but displays nothing


  1. draptak
    Posts : 52
    Windows 7 Ultimate 64-Bit
       New #1

    PC powers up but displays nothing


    My PC is acting weird, was good now all of a sudden it lost power, sometimes it will turn on and display nothing, then I turn it off, and it won't back on for a few hours or the next day. What is wrong here? I had this motherboard for approx 8 years

    I'm using a CX750M corsair PSU, I had this tested using the paperclip, it powers on with the fan running.

    I tried a new CMOS battery to see if it solved the problem. No luck

    I switched the Jumpers (CLRTC) back and forth vice versa, but no luck in that

    I unplugged the RAM sticks and back, and I still used one RAM stick to see if it would turn on but no luck

    I also tried to see if the Power button is the issue using the screw driver method on the two pin. but no luck.


    Any solutions would be welcome, I'm thinking my motherboard might be dead? But the LED light is on


    Specs:
    PSU: CX750M corsair
    CPU: Intel® Core™2 Quad Processor Q9400 at 2.66 GHz
    GPU: GTX 770 2GB DirectCU II
    Memory RAM: 6GB
    Windows 7 64bit
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  3. Megahertz07
    Posts : 7,351
    Windows 7 HP 64
       New #2

    Does your MB has internal graphics to test without the GPU?
    Have seen the same problem due to corrosion on the MB. Do you live by the sea?
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  4. draptak
    Posts : 52
    Windows 7 Ultimate 64-Bit
    Thread Starter
       New #3

    Surely its nothing to do with the GPU. I already tried my old GPU but same story I'm not getting any thing on my monitor. I know my monitor isn't the problem.

    Megahertz07 said:
    Does your MB has internal graphics to test without the GPU?
    Have seen the same problem due to corrosion on the MB. Do you live by the sea?
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  6. Megahertz07
    Posts : 7,351
    Windows 7 HP 64
       New #4

    Have seen the same problem due to corrosion on the MB. Do you live by the sea?
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  7. Bat 1
    Posts : 235
    8.1 home x64
       New #5

    You have a decent PSU but even those can go bad. If you have a multimeter you could check the 12V output. More likely given the MOBO ago would be bad capacitors. Get a magnifying glass and carefully inspect the capacitors on the MOBO especially those closet the CPU socket.
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  8. johnhoh
    Posts : 1,363
    Win7 pro x64
       New #6

    I think that psu is fairly new, so you probably have a bad motherboard.
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  10. TechnoMage2016
    Posts : 714
    Win 7 Pro, SP1, x86, Win-11/Pro/64
       New #7

    With an 8 year old PC, that's never had any major upgrades, anything is possible.

    That PC definitely dates back to the days when many manufacturers were using those cheap Chinese capacitors that would fail, bulge and leak after a few years of operation. Those Bad Caps wound up in PSU's as well as motherboards. Every failed PSU that I've looked into had bulging capacitors. And likewise the failed motherboards.

    I'd have to use a PSU tester on that PSU to make sure that ALL of its output voltages are present and at the proper level. If just one of the lesser voltages, like the -5v, is missing, the motherboard won't boot up. Poking around with a VOM can work, but is fraught with problems.

    There is one failure mode that has thrown many a user and inexperienced PC tech for a loop. It's an old and failed CMOS Battery that has caused a Lock-Up condition in the BIOS. In such a case it is necessary to remove all power from the system, then remove the old battery and then wait at lest a half hour before installing a NEW battery.

    I've actually been given several PC's over the years that by all indications were totally DEAD. After performing the above procedure, the PC came back to life and worked perfectly. It's just not something that we see every day.

    Good luck Mate,
    TechnoMage
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  11. mrjimphelps
    Posts : 1,784
    Linux Mint 18.2 xfce 64-bit (VMWare host) / Windows 8.1 Pro 32-bit (VMWare guest)
       New #8

    TechnoMage2016 said:
    Every failed PSU that I've looked into had bulging capacitors. And likewise the failed motherboards.
    A benefit with this problem is that it is very easy to know that this is the problem just by looking at the capacitors. I saw a lot of failed motherboards with bulging capacitors back in the early 2000s. Pull the cover off, take a quick look, and you're done diagnosing the problem. And if I told Dell that that was the problem, they immediately sent me a replacement motherboard, no questions asked (if it was still under warranty).
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  12. TechnoMage2016
    Posts : 714
    Win 7 Pro, SP1, x86, Win-11/Pro/64
       New #9

    What really burns my grits, is the person who asks what to do, and then refuses to even pull the side panel off of their desktop PC, to just LOOK at their motherboard. Let alone opening up their PSU to see if there are bulging and leaking capacitors inside.

    Those folks should just get off of the forums and take their PC to a reputable repair shop, for diagnosis and repair. (NOT the Geek Squad!)

    Cheers mates!
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