May 17, 2012

wont boot or display on monitor

ok, I build computers, nothin fancy just assembly. I had an hp working fine. I removed the ram and installed the same but 2 512mb instead of 2 2gb stick both ddr2. computer now beeps when turned on, but wont display or boot. I had it sitting in limbo for 2 months untouched. What could be my problem??? I am unfamiliar with this error. pls help....