New problem arise. When powering up my computer it shows cmos checksum bad, press f1 or f2. After booting and setting date and time in windows. It runs for 10 to 12 mins and restarts automatically. After restart no cmos error during booting and the system runs nice continousely until I shut it down. Next time or later when i turn it on there is cmos error and restarting after 10 minutes. I cant get the problem sloved. please some body help me. Thanks in advance.