Computer not working no video

[lemmy]

I just built a new rig with specs in my sig, and basically no video output at all. But here is the story

I started building this rig last year but had video then the video and ran computer fine, but then i started OC'ing then the video output died, i tried reseating vid card, and using another vid card and reseating processor and still nothing. So i thought my motherboard was dead, so i bought a new DFI lanparty NF4 ultra and a new processor opteron 170, and a new video card 6800 gto warrantied 3 years now, and tried putting everything together again, and still no video at all, now i'm guessing it's the power supply. But my power supply runs the liquid cooling system and motherboard fine and i hear all fans running good, so is it thepower supply or not? what should i do give me help please
__________________
DFI LanParty NF4 Ultra-D
Bios (Not sure, because unable to see it al all due to problem above) (Purchased twice, new one now)
Opteron 170
Kingston 512MB PC3200 400MHz 64x64 HyperX DDR Memory 184Pin - Model #KHX3200A
120gb PATA Maxtor 7200 rpm (old ass hard drive)
Dell DVD-Rom player(ripped it out of my old comp)
6800 GTO
Blue Forton 500W
Windows XP 64-big




*COOLING*
Aqua-computer Brands Only
Evo360 Radiator
Cuplex XT CPu Block
Aquagra 6800 FX GPU Block

 

[Cript]

any beeps from your pc speaker? does your board have those 4 diagnostic leds? either of those can tell you what could be wrong. no beeps = your cpu could be the culprit. power supply probably wouldn't be the problem as long as the board powers up (fans spin, leds light, etc) when all you want to do is POST. It can be a problem afterwards like random resets under load and such.

 

[lemmy]

no beeps, and 3 red lights

 

[Cript]

your memory could be the culprit if you're getting 3 lights

http://www.dfi-street.com/forum/showpost.php?p=126705&postcount=4

try using one at a time in different slots (when i owned a sli-dr, the orange were the most stable) or testing them in another computer if you can.