PSU broken?

[Flipip]

Hey guys, I've struck a bit of a problem with my PSU's.

Recently I bought a new motherboard and processor, and I thought I had installed something wrong when I saw nothing appear on my monitor even though everything inside looked correct. I was using my 600w PSU at the time.

Long story short, I replaced my ATI Radeon HD 5770 with my Nvidia 6600gt and 200w PSU to see if it was the graphics card, and it worked. Booted up fine and I saw the lovely Intel splash screen come up.

I then tried the same set up with my 600w PSU. Nvidia 6600gt and 600w PSU, but it just didn't work. Fans were spinning, but there was no output on the monitor.

I'm in a bit of a pickle. I can't use my 200w PSU on my ATI card as it's far below the requirement, but my 600w PSU doesn't want to work with my new motherboard (and now my old motherboard, for some reason). Would I be right in saying my PSU has bit the dust? Or can I open it up and see if something has gone wrong?

Thanks. (Sorry if this isn't the right place to post this too!)

 

[weird_dave]

Might not be liking the hardware change, I'd try resetting the CMOS first.
Then I'd try the 200W PSU anyway, it'll be fine for just testing if it will POST.

 

[Flipip]

Might not be liking the hardware change, I'd try resetting the CMOS first.
Then I'd try the 200W PSU anyway, it'll be fine for just testing if it will POST.

Alright, I just need to install W7 and put in 3gb's of RAM. Then I'll try resetting the CMOS, putting in the 600w PSU, and trying again.

Will post how it goes later, thanks.