On Feb 6, 9:56*am, n8ball wrote:
hi all...

any idea as what to check on these units?

Don't assume it's the power supply until you have
reset the motherboard. Some kinds of (power surge
or other) faults result in a shutdown that requires
a motherboard reset button be pressed, or (if you
can't find the button) remove the clock battery
for a few minutes, then reinstall.

Cable and mounting details are slightly different from
commercial replacement supplies, you'll have to
get an Apple replacement, or open the power supply
up for component-level troubleshooting if reset doesn't
fix the problem.