Thanks alot Legendster,
I tried other fresh ram in second port and it's not working, so only one slot i sworking properly. Currently its samsung ram 4GB in that slot. And i am having issues of blue screen errors as well.
A month back i installed fresh window 7 homebasic 64 bit in it, but that doesn.t solve anything.
I feel, its an issues with Ram which isnt compatible with slot provided in motherboard.
Please advice.