Hardware Problem

Hi guys,

Mate is having a problem, have copied this from another forum.

Hi guys,

Really annoying problem.
The other day I unplugged my PC at the mains (PC was turned off) and then plugged it back in, tried turning it on and nothing happens. Unplugged everything from the PC and from the power extension and tried again, fans on the PC spun up for a second but then just stopped.
Power and Reset lights on Mobo started to flash after this was done.

Removed everything from Mobo (gfx card, RAM) and tried again still powers on for a second then turns off and lights go back to flashing (to stop the lights flashing I had to turn the PSU off.
Presumed it was the PSU that had failed so bought a new one (SilverStone Strider Gold SST-ST1000-G).

Installed the new PSU and plugged everything in and the same thing happens, power for a second or so and then powers off. Unplugged everything but Mobo from PSU and tried again, still nothing. Unplugged all RAM and it then powered on. Put one stick in, powered on fine, put Mobo 4pin into PSU and it then failed to start, unplugged it and it worked fine again.


Plugged everything in PSU testing one at a time and they all worked apart from when the HDD was plugged in, that had the same affect as the 4pin Mobo cable. Did a few more tests and it's now stopped powering up again even with only the EATX cable plugged in, RAM removed. Unlike before when it fails to power up the Power and Reset lights do not flash, they remain constant.


Checked all components none, look singed or bulged. Checked CPU and it looks fine.
When the machine did power on even with it plugged into the monitor nothing was displayed.

Any help is appreciated :).

Mobo: ASUS P6T
CPU: Intel i7 (Corsair H50 water cooling)
RAM: 6GB Corsair Dominator
PSU: SilverStone 1000watt
GFX: Nvidia GTX295

Did he turn off the psu (switch at the back) or at the wall socket before he unplugged it?

Sounds like his motherboard died.
When you plug and unplug the psu mains cable you can get arc's and power spikes if the cable is live which send spikes into the psu, a good psu shouldn't pass these on via the +5vsb (if the psu is switched on at the back) but it can, these spike carried over can fry the board.

Might be able to get away with replacing the BIOS chip (loove like it's the removable type rather than soldered in.
It's a long shot though.

Just got a text saying he has got it to Windows but his USB devices arent showing.

I think its a dead motherboard like I told him last week.


Apparently the PSU didnt have a switch on it so im suspecting something cheap and crap..

Probably spiked the motherboard.

At £13ish quid it might be worth trying to swap the BIOS chip http://www.ebay.co.uk/itm/Asus-P6T-B...item415ea9a955

I dont think he would chance that lol.

Apparently the PSU is an Everest model with the power cable attached to it :/

Apparently, its now working fine with no issues...

FSP did a series called everest, but they didn't have a fixed psu cable and do have a power switch.
http://www.scan.co.uk/products/600w-...uiet-fan-atx-v
unless he means that the 24pin and 4/8pin connectors are fixed,which is standard on most modular psu's