Thanks .. I've received numerous good places to get it repaired .. I guess what I'm still trying to do is troubleshoot / fix it myself for free, because it was free. I have limited funds right now for photo hardware, and this is way at the bottom of my priority list .. fund wise.
Do you know what diodes and bridge-rectifiers look like, electrolytic capacitors and the different types of ICs? If no, don't bother: you could make it worse by zapping working components.
If yes, start at the beginning (electrically speaking) and look for any fuses inside the casing and on the circuit board. Check the power supply voltages. In the absence of a workshop manual with the circuit diagram etc, measure the voltages across any large PSU capacitors and the digital components. Unplug and re-plug any connectors one at a time. Sniff the board - is there a sickly/sweet smell that speaks of burnt-out transformers or inductors? Are any of the power supply capacitors leaking or looking bloated?
You can probably download the data sheet from the manufacturer's website for any chips including the inevitable microcontroller on the board which will tell you the power supply pins. Be VERY careful not to short out adjacent pins.
Frankly, if it's not the power supply then it is almost certainly too complex a problem to be fixed without experience of board-level troubleshooting and the necessary tools and equipment.
Good luck.