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hoefla-
Be careful around power supplies btw - the large capacitors (cylindrical things) can hold a charge after it's been turned off and give you quite a zap.
Certainly reseating connectors is worth a shot, but I wouldn't hold out a great deal of hope for that working.
You really need to get out some test gear and measure voltages I think.
rhowe
Could be that something in the power supply gave up the ghost. Electrolytic capacitors are the most common culprit. The electrolyte can dry out over time and then they can go pop