PC keeps turning off

[tigeredo]

Hello,
I have a GIGABYTE GA-EP45-UD3P Motherboard that I've been using for a while until it started to turn off anytime I move my PC. Or doesn't start the next day I try to turn it on.
It showed the led and turn off, no sound.

After a while, I ended up knowing that the problem is related to the CMOS battery and/or Bios.

I've changed the battery and now what I have is that the pc turns on but turns off randomly few seconds after the boot. Sometimes it turns off at the bios start, sometimes at the windows load.
(I've tried 3 batteries and cleared CMOS but still nothing)

Does anyone has a idea how this problem could be fixed ?

Thank you.

 

[Mac070]

To be assist you I'll need a explanation of your computer specifications. Please provide a detailed list of processor , power supply , video card , ram , etc......

 

[tigeredo]

I have a Q9505 CPU
550W power supply LC-Power LC6550GP2 v2.2
AMD Radeon Saphire 7870
8 GB RAM DDR2
500GB HD drive.
This is all what I'm connecting to the motherboard right now.

 

[Mac070]

Replace the power supply . The one listed is very poor quality .... Do you have a spare to rest the system with ?

 

[tigeredo]

I'm replaced the PS with a 600W PS, still the same. It turns off when I try to access bios. Sometimes the PC stays on for a split of second, sometimes it turns off on windows load...

 

[Mac070]

Take out your graphics card and use your on board gpu if you have any .. see if it shuts off

 

[tigeredo]

With the Nvidia gt 640 still no changes, I tried also with no graphic card at all. This is so much confusing….

 

[Mac070]

Try the 600w power supply with the graphics card uninstalled .... Use onboard graphics