The problem clearly in the power supply (more than once there were such cases). For this configuration, at a minimum need 500W. Of the good BP can advise.

Definitely BP!

After replacing the BP, even the UPS no longer warm, barely warm.

I have a question. Why right after the replacement of the BP from 400 to 620 W at the first start 3DMarka06 computer hangs again?

Problem with the video card you have purchased 768Mb <PCI-E> DDR PX8800Ultra Leviathan (RTL) + DualDVI + TV Out + SLI <GeForce 8800Ultra> as I wrote earlier, just put the PC restarts the power supply at 730 w problem is not solved is the cause itself EVEREST Ultimate Edition program shows the following graphics adapter VGA (768 MB) or more simply that all of this at whist last downloaded 158.42_forceware_winvista_64bit_international wood and some were on the disc 158.18.

The first power supply may not be so lucky, because had not yet normalized leakage electrolytic capacitor. It should be 10-15 minutes of work that they have recovered oxide layer are included in normal operating mode. The point is that under long-term storage oxide layer slowly dissolves in the electrolyte, and it takes time for his recovery.

Tip: Typically, these capacitors capacity is not always enough. As a result, block, sufficient power is still not pulling... It's easy to correct. Just solder the wire directly to +12 volts (yellow wire) and the mass of the condenser capacity 1000mk at 16volt.