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PC won't boot with new PSU

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Trev88 - Aug 25, 2009 at 08:51 AM
 Trev88 - Aug 25, 2009 at 11:32 AM
Hello, I recently bought a new Radeon 4850 x2 video card and upgraded my PSU to a Corsair 750w.

I installed the PSU and the PC won't boot into Windows Vista, I can get into the BIOS and see my hard drives but when the PC boots it either says they've failed or No Boot Device installed.

If I install my old PSU the PC works just fine again but as soon as I connect the Corsair PSU it won't boot up into Windows.

I was going to send the PSU back but I've connected the Corsair up to an old HP computer with XP pro on and it works fine, no problems.

Any ideas on this anyone?
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Answer 1 / 1
Blocked Profile
Aug 25, 2009 at 09:07 AM
Dear Sir,

I just think that the Corsair PSU isn't compatible with your system (motherboard )

You will have to try another power supply unit

Thanks
-1
Trev88
Aug 25, 2009 at 11:32 AM
Yes I think you could be right, how do I know what is compatible and what isn't otherwise I may end up buying another one that doesn't work?

I've just been trying again (in vain) to get the Corsair to work. Now even when I fit the old PSU back it takes a lot of messing around to finally get it the pc boot, I have to keep swapping the motherboard and power cables over on each HDD many many times and reboot it each time for it to finally configure, lots of 'drive failure' 'error auto-sensing secondary master HDD' and 'No Boot Device Available' messages before it finally works, very odd.

Funny how the Corsair PSU will work on a 6 year old HP Compaq but not on my new system. The only difference is the drives aren't SATA and the Motherboard connector plug is 20 pin not 24.
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