Restarts after login screen

[waterpyro]

ok here it is in a nutshell. computer works fine before i send out the ram sticks to gskill and now i get the new ram sticks and i install them. get to the windows xp screen log in. see my background then computer goes black and restarts . what could the problem be. cant be the ram i dont believe and i forgot how to fix this. i've experience this before but a long time ago

any clues
cpu e8400
610wats
saphire ati 5770
ram 2x1gb ddr2 800 running at 4-4-4-12 2.0volts

 

[tortnotes]

It can't be the RAM? That's the only thing that's changed.

Try running with only one stick of RAM, and try different slots on the motherboard. See if you can run a memory test utility off a CD.

 

[masterasia]

It might be the Power supply.