memory causes crash

hi guys, i wish you could help me. i have two memory slots in my computer i placed a 512 667 DDR 2 in one slot. if i add another
512 in the vacant slot my computer crashes every now and then. if only one memory card on any slot is in place my computer
is okey. what is the problem ? i need help.

They're most probably due to faulty/incompatible RAM. Please perform these memory tests:

http://www.pcstats.com/articleview.cfm?articleID=1565

http://www.memtest.org/

[quote="edot"]i placed my memory in my friends computer , it worked fine, memory good. i borrowed his memory of different brand and installed it in my computer it worked fine. it was compatibility problem. Thanks Doctor Inferno. Keep up the good work guys !!!

You're welcome!