Unless you are able to find and supply a schematic, or possibly draw one yourself from the board, I think it's going to be very hard for anyone to help you. I look at the PCB and I see some components missing. It's probably normal but how am I to know?
PS. Since you supplied some REALLY nice in focus photos I looked at them anyway. As you may have guessed, the power supply is in the upper left of the second photo. One of those components is about as big as a grain of sand. Let's hope it's not that one! I don't see anything obviously wrong. Could be:
a) mechanical failure - broken wire, cracked solder joint, broken SMT component.
b) Electrical failure, e.g. shorted electrolytic. Can't see anything wrong visually. No burns or distorted (swollen) components. You can probably measure right across any of the large electrolytics with an ohm meter - they should NOT be shorted.
Also, since it's just sitting there, resolder the connections on that green jumper wire connected to the power input jack.