Pc Won't Power Up

By spencerarts ·
My son turned off my pc 5 days ago, it had shut down the normal way, he also turned off the power switch at the back of the computer (he has never done this before). Now it won't power up, even after 5 days. There is a green light flashing on the motherboard, but no other sign of power. This is the 4th time this has happened. Sometimes it will power up after about 4 or 5 hours, but on one occasion it took about 5 days. I did nothing to the PC to get it to come back on again. But it always starts up again.

Will it come back on again, as before, on it's own accord? If not, what can I do to get it to power up, & what is causing it?

The PC is a an Athlon Dual Core 2800 PC with 2 GM Ram.

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The make and model of the pc would help

by Jacky Howe In reply to Pc Won't Power Up

Test the Power Outlet or Power/Board by plugging in a radio or lamp.

Try another Power cord/lead if you have one.

Remove the Power cord from the PSU to discharge the Capacitors in the Power Supply. Then press the Power button for 10 seconds to discharge the Capacitors on the Motherboard. See if it will start. If it does start you can replace the (PSU) Power Supply Unit as it is faulty.

Swap the Reset connector on the Motherboard to the Power connector to rule out a faulty Power switch.

Remove the Power lead from the PSU, disconnect the 20-24 pin power connector from the motherboard. Reinsert the 20-24 pin power connector to the motherboard.

Swap the Power Supply unit for a known working unit if one is accessable.

Check the Capacitors around the CPU for swelling or bulging. They should have a flat head with a cross indent.

Clean the golden edge of each memory stick with a soft rubber/eraser, remembering not to touch the golden edge of the memory stick. Check with one stick at a time, remembering to disconnect the power from the PC.

Remove and clean the Video card with a soft rubber/eraser and then reseat it.

Remove all Add on Cards and see if it will start. Clean the add on cards before reinserting them one at a time and testing.

Faulty Fans, Dust and Grime build up on the Heatsink restricting air flow. I would give the inside of the case a blowout with compressed air. When blowing air through the fans make sure that you physically stop them from spinning, as they may generate power and **** something up. Remembering to ground yourself by placing the back of your hand on the Power Supply Unit and not moving your feet. By not taking this precaution it is possible that you could inadvertantly cause damage to the PC from an electrostatic discharge. Then remove the Heatsink, giving it a thorough clean and reseat the CPU applying new CPU grease. If the Fans spin freely when you give them a spin they are probably OK. If there is resistance replace them.

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You dont need anything else

by BizIntelligence In reply to The make and model of the ...

Jacky has already mentioned everything so you dont need further suggestions.

Good on you Jacky...

Cheers !

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PC Now Works Perfect

by spencerarts In reply to The make and model of the ...

Hi Jacky,

Thanks for the help, much appreicated. I unplugged the power cord yesterday and on reading your reply 5 minutes ago, did what you suggested. I held the power button on for 10 seconds, plugged the power cord back in, & switched the PC on again. It started straight away like nothing had ever happened. All running perfectly as normal.

The PC is pluged into a Power Surge socket, & the Power Supply is a "Switching" 650 Watt.

Any idea why this happens once in a while. The PC was quite expensive and has all the best parts in. It has run pefectly OK in the 16 months I've had it, and apart form this rare & occasional intermittent switching on problem, has never once crashed or frozen!

I bought another PC from the same company and that runs like clockwork. That one is a Quad Core 5500 MHZ Intel Processor with 2 Nvidia GeForce GTX 9800 Graphics cards, 8GB Ram, & a 650 & 500 Watt Power Supplies.


Mike Spencer

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by Jacky Howe In reply to PC Now Works Perfect

the PSU before it does any damage to the Motherboard or any other Devices. A good choice would be an Antec.

OH Smeg gives a good description of what can happen.

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This sounds very much like a weak PS here

by OH Smeg Moderator In reply to Pc Won't Power Up

Replace it with a Known Good One and test the system.

Ideally PS's are designed to fail to prevent further damage occurring to the inside of the case so when Spikes or other rubbish comes over the Mains they should sacrifice themselves instead of passing the problems inside the case. Well the better ones at least do this.

After all it is considerably cheaper to replace a good PS than to replace the entire computer. Of course depending on who made the computer that may not be the case here and the problems have been allowed to reach the M'Board, CPU, RAM and HDD which have been Damaged.

You can test the Hardware for correct Function with the Ultimate Boot Cd available here


if you can get it started again.


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by computechdan In reply to Pc Won't Power Up

certain it's a power supply that's on the way out.

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