Possibly. You will need to hook a multimeter up and check your voltages. If low, check and see if the power supply has a 5v adjustment pot. If so, you can try and bump it up to 5v.
Dont attempt to adjust this pot without your meter hooked up.
Midway/Atari used those Peter Chou units (that I've seen enough of to know..) where over time the adjustment pots either get gummed up or it's time to trash the power supply. they also seem to still run good, you just gotta give them a little TLC.
first verify that your power supply's cooling fan is still working. then follow the PSU link in my signature for how to work on it.