Sounds worse off now. The previous issue, I've had with my cabinet, if the PCB board was not properly fitted into the Jamma harness.
As for your current issue, check all fuses obviously first, make sure things were soldered the same way (wires matching up) as they were before, and if you have a voltage meter and are comfortable with testing AC power through the power cord to the power supply, check if you have the 120v AC reaching power supply.
Sounds like no power getting to power supply now, or you fried power supply? (or blown fuse, preventing power going out to components)
Tim