Computer breakdown can you help?

At first my computer wont start up so i decided to rewire everything (which usually works and did this time too) but when i plugged the printer to the AVR the wires started to spark the it turned off again. Nothing smelled but when i tried to open the power on CPU again it wont open. Please help i had all my files,... show more At first my computer wont start up so i decided to rewire everything (which usually works and did this time too) but when i plugged the printer to the AVR the wires started to spark the it turned off again. Nothing smelled but when i tried to open the power on CPU again it wont open. Please help i had all my files, projects and reports on it. PLEASE!!!
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