sorry karon ra ko kaupdate:
I used Windows Memory Diagnostic Tool para dali
test 1:
slot 1: 512mb(new)
slot 2: none
status: no problems detected
test 2:
slot 1: 512mb(new)
slot 2: 256mb(old)
status: no problems detected
test 3:
slot 1: 512mb(new)
slot 2: 512mb(old)
status: hardware problem detected
conclusion: old 512mb mem stick is defective.
lesson learned: never buy a "more than a year old"-RAM from an "Istoryan" who isn't a trusted seller ^_^.
THANK YOU MGA MASTERS![]()