urgent need hlp my pc freeze

[waleedy]

the problem:the pc dont power up ,so i changed the power supply,then every thing went fine ,but now it stop at ram test and display"current ddr frequency 200mhz ",and it show "press del to setup or esc to skip ram test ",but the problem that i can't make the KB work,i have tried 2 keyboards, but no success even change ram not hlp.my pc:
p4 2ghz,256 ddr 266mhz,MOBO p4x266a(socket 478 with via chipset),any idea?by the way should 3 dimm's be fitted with memory stick ?i have 1.

[edwin]

open the case and inspect for signs of this problem:

http://www.badcaps.net/ident/