Solve : sound of siren?

1.	Solve : sound of siren?
Answer» Hello everybody, i turned on my computer yesterday and after 3 SECONDS there was a sound of siren (like a fire truck) and the computer immediatley turned itself off. i have to mark that the siren was still singing altough the com' was off... what should be the problem?? how can i fix it? PROBABLY overheating or something is hooked up wrong... Have you MOVED the machine recently and/or added any new hardware ? ? Post ALOT more info about the machine as WELL.

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