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my computer is fucked...2
ok first off
you had to post that in previous thread, not opening new one. anyway, as i have already said, it happened to me without some obvious reason, and simply disappeared after some time. try to enter safe mode and run some AV programs, but i would suggest to try running windows on last known good configuration. (while booting pres F6 or F8 , always forget which one is it :/)
i remember the first time i built a computer (quite a while ago) i didnt have the cpu fan in properly and the motherboard logo would flash in front of the screen then the computer would shut off, could be something similer but i doubt it unless you messed wit the insides recently.. probably a virus tho do what every1 else said