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system windows 7 getting hang while work and resolution also goes off
I am using desktop system windows 7 OS and it was working properly till last Friday when I was working on that day my monitor became fully white and system hang up so I restarted my system, that time on wards some time its restarts and sometimes its showing resolution issue line fully doted or lines etc.. so I thought it may be some RAM issue so I checked the RAM it is working properly and i checked the BIOS also but no use I face the same problem, what should I do to sort this problem, I will be grateful if anybody advise me.