I removed the top cover to retrive a dvd and when I put everything back together the unit would not power up. I checked power going to the unit 120 volts, but I did notice a small buzzing sound from the board that powers the unit.
I would seriously take it to an electronics repair shop, if one is close by. Otherwise, you may want to check that you left all connections as they were, that nothing was left in the machine that might cause problems, and possibly use a computer vacuum to sweep out any dust. Be sure to check that all wires for the power supply are connected, and not exposed, because an open-air circuit will disrupt the connection with carbon scoring from the air around being ignited. That might explain your buzzing.
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