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I have an aunt with a unknown problem on her computer. The monitor does not display anything, and displays no input. I am almost positive that the cables as well as the monitor are in working order. However, the computer has once been able to display an image since the problem began. Antivirus as well as Anti-spyware are run weekly, and I am unsure how to diagnose this problem? Is there anything else I should do in terms of diagnostics or should I bring this to the geek squad?
Sony Vaio P4 2.4 GHz
Windows XP Home