Hey bambiboomz , If its a software problem or something like that it should be solved when i reinstalled os or when i installed other OS. So gues that it could be the problem in bios . hence i tried updating the bios. nothing helps... But anyway Now my problem is fixed.. I removed my graphics card from motherboard and reinstalled it properly and also I reseted the CMOS by pressing the button near CMOS battery for 10secs ... I dont know which solved the issue. after 3 months of struggle I solved the problem myself.... Thanks for your reply.
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