As you havn't really given us enough details about the problems so here are just a few suggestions.
Any thunder storms in your area or the surrounding area?
A cable could have been bumped loose at some point inside the box
Depending on how old the computer is it might just be ready to die.
If you give us some futher details then i might be able to work it out and think of a few more things but at this stage this is all i can think of.
lasher511
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