Help!!!.....put in antec 500w earth??? and still have freezes. pulled out adata 1gb x 2 ddr 400 ram, left the hp ddr400 512mbx2 ram sticks and evrything worked fine!! But then, like a dummy i pulled out the hp ddr 400 ram, placed the adatas in those slots and now having problems booting up xp. CAn't boot in safe mode or last known good configuration either. Took out the adata ram and put back the hp ram and am having the same " no xp boot" problem!!! even w/ the original ram that had worked fine!!! please help!!!