Faulty PSU?

Hi, I've just finished setting up my PC, and am a first time builder. When trying to turn it on for the first time I heard a loud, continuous beep. Other than that everything seemed to be working, fans, leds, power supply light etc Anyway, going back inside I noticed the 6 pin was not connected to my gfx card, so after doing that I tried again. This time the only thing that happened was leds came on , although no beeping. I tried a different pci 6 pin connector, same problem. So; any suggestions? PSU underpowered? Faulty? Graphics card faulty? Or something else? I am planning to try a different graphics card tomorrow, but have no time today so thought I would post now to get some early response.

My specs:

OCZ GameXStream 600w Power Supply

Western Digital Caviar SE16 400GB SATA-II 16MB Cache 

Intel Core 2 Duo E6750 "LGA775 Conroe" 2.66GHz (1333FSB)  

Antec P182 Super Midi Tower Case

Asus P5N32-E PLUS SLi nForce (Socket 775) PCI-Express DDR2 Motherboard

Corsair 2GB DDR2 (2x1GB) 

BFG GeForce 8800 GT OC 512MB

edit: see a few posts down for update on problem

This may be helpful :

http://www.pcstats.com/articleview.cfm?articleID=1223

Boot with one memory stick in one of the slots (I cannot remember which one) then go into the bios and set the voltage and timing.

Also don't forget to connect the 4pin to the motherboard.

Thanks for replies

to update problem: I tried switching RAM setups, having 1 stick only etc; no change. I tried switching gfx card (ati x600 now in atm). PC now starts fine, can finally get into BIOS etc but after 30-60 seconds PC turns itself off :(. Bearing in my mind my pc wouldn't turn on when I had my 8800gt in I think it is now fair to assume my psu is faulty? I do not have a spare to confirm my theory, but I honestly can't see anything else may be wrong.