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My PC was running fine. Then happened that there was no signal to LCD , Keyboard , Mouse. I took everything out , cleaned Motherboard from dust. Then it was working fine. Then after a week the same problem has ocurred , I have tried everthing which I done previously but to no avail. When I took off all RAMs then there is no beep sound? Please guide me.

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intermittent video/USB power together with a week-long reprieve after cleaning points to a borderline power or shorting issue, not dust alone. I agree with that the PSU is suspect, but also add two quick checks: make sure the 24-pin ATX and the 4/8-pin CPU power plugs are fully seated, and if your board uses a plug-in piezo speaker, attach one. Your "no beep with all RAM removed" only helps if a speaker is actually present; otherwise the board will be silent even when healthy.

To rule out case shorts and a flaky front-panel switch, do a bare-minimum bench test:

  • Unplug AC, hold the power button 15 seconds to discharge.
  • Remove the board from the case and place it on plain cardboard.
  • Install only CPU + cooler, one known-good RAM stick in the primary slot, and either onboard video or a simple GPU. Connect the case speaker/buzzer.
  • Connect only the 24-pin ATX and 4/8-pin CPU power.
  • Clear CMOS with the jumper if available; if not, remove the battery for a few minutes, then reinstall.
  • Start the board by briefly shorting the PWR_SW header pins with a screwdriver tip (do not use a knife; it can bridge the wrong pins). Watch for CPU fan spin and listen for beeps.

If you still get no beeps even with RAM removed, swap in a known-good PSU. If that changes nothing, the motherboard is the prime suspect, as you and noted. Also inspect for mis-placed standoffs, loose screws under the board, missing GPU power leads, and any bulging/leaking capacitors near the CPU VRM. Finally, reseat RAM and clean contacts with isopropyl.

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You were trying to say that your motherboard isn't working right?

In that case change your PSU (power supply unit). If there was no light from any hardware, that should be the case.

You can test your PSU if it smell something like burned. If you can smell the stench and it's heavily smell, definitely you'll need to replace your PSU.

Consider sending it to your local store for further checking in case mine was wrong...

Member Avatar for hussanali

Actually problem is that there is dust around my processor. Considering that a lot of PC has dust this wont be problem. My PC has infact started like Magic after I have written the thread. But now same problem persists. Also I dont have jumpers setting on motherboard. I know only one power jumper so I make it go with a knife. PSU is working fine. Can there be problem due to jumper settings. If so then what?

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jumper is for BIOS if I wasn't mistaken. If you say it's jumper problem, then it may be BIOS problem. To reset BIOS, you'll need to remove the battery (the small one inside) and wait for 20 minutes to let it reset. Might consider plug out all power cable for effective reset.


But I don't think the jumper is at fault here. When your computer is not running, there're 3 possibilities... PSU, Motherboard and RAM (processor also with motherboard)

Go with this order...
If no beep when starting up attach/disattach, meaning RAM is fine
If power can be on after new PSU is install, meaning old PSU is at fault.
If you've test both and computer still wont start, meaning you got faulty motherboard.

Well, before trying above, you should unplug all cable attached to your motherboard.

Member Avatar for hussanali

I think than Motherboard is faulty. Will see a technician soon.

Member Avatar for a.oprea

yes, could be a motherboard fail. I had a similar problem on a laptop and turned out some chip on the motherboard was busted

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