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We fix and repair laptop motherboard no video, no...
Do you have any more particulars? Can you get into the system BIOS? Can you get in to the Startup Order setup, like Hard Drive, or DVD, because if you can boot from DVD then do it and see if the computer behaves normally. The "critical error" might go away if booting from DVD too.
need more info. When did this start, did you down load a file from an unknown sorce. Can you boot into bios with out crash? ETC.
more info please model is it in a system whats plugged into it unplug everything from mb sept power and video and keyboard then try