Restarts after login screen

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
saphire ati 5770
ram 2x1gb ddr2 800 running at 4-4-4-12 2.0volts
2 answers Last reply
More about restarts login screen
  1. 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.
  2. It might be the Power supply.
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