Desktops forum: need help with pc that wont power up

by: marc404 January 30, 2013 8:54 PM PST

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need help with pc that wont power up

by marc404 - 1/30/13 8:54 PM

Hi all... I have had an issue with my desktop for the last 7-8 months... Its driving me nuts and costing me money... Ive been building pcs for several years and never came across this issue ever... Heres whats happening:

My pc normally works fine... But for some random reason, (sometimes) when i shut the pc down, it will not power up again... (everytime) i shut the pc down and switch off at the mains it will not power back on...

Now.. The first time this happened i checked everything and rushed out and bought a new psu thinking the one installed had died.. On fitting the new psu the pc would not power on... I went through lengthy trouble shooting and could not find a solution... So i took the desktop to my local repair shop they diagnosed it as a dead motherboard...

The motherboard was only a couple of months old so i took the board back to the shop i bought it from looking for a replacement and explained my issue and diagnosis from my loca technician.. Staff in the shop i bought it from plugged it into a test set up and it powered up... Redfaced i left the shop with the board... Plugged it back into my desktop... And it wouldnt power up... I phoned the shop... They said bring the whole desktop in... I brought it in and said they would call me... They called me ten minutes later saying that the pc powered up no problem after i left the shop... Redfaced again but happy happy i went home.. Plugged in and the pc did power up lol...

Few days later i finished working on my project... Shut the pc down.. Switched off at the mains... Got up the next day and it wouldnt power up.... Took it back to the shop for diagnosis... They couldnt power it up... They recased it and it powered up... Then they put everything back into my case... And it powered up... They called me to come and collect it.. I went in and the guys handed me my desktop and it should be ok now... I asked them to pkug it in and show me... They plugged it in and it would not power up hahaha.. Crazy... They came to the conclusion that there was maybe a fault in the psu but i explained that i had already replaced it... But they replaced it anyway... And it worked... I took the desktop home and all was fine... But only fine if i do not switch off at the mains.. Was talking to my project partner about it on the phone one night after the pc not powering up for a couple of days... I said to him.. 'i will try it just now' and guess what.. It powered up...

Ive never experienced anything like this before... Please help me out guys lol

heres the specs:

Motherboard: Gigabyte 990XA-UD3
Processor: AMD FX 8120 8-core black edition
RAM: 2 sticks of 4GB Corsair DDR3
Graphics: ATI Radeon HD5450
PSU: Powercool Extreme Mod 850W
OS: Windows 7 Ultimate 64bit

forgot to mention.. I changed the RAM too as i heard there was issues with ripjaw ram and the cpu. Thought it might have been what was causing the issue... Didnt make a difference.. Except for the increase in performance of course... When the pc does power up i have absolutely no issues at all its very rubust and fast... Any help would be great thanks in advance happy

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