POE issue on a N3024

I have two N3024 switches in a stack.  The switches have been up for several months.  The AP has only been connected for a couple of weeks. Originally, on the power status, from the show power inline CLI command, unit one was on and unit two was off.  I was never able to find a command to turn the power on unit two. I have one POE AP connected to unit one. Early in the morning of March 11th the AP lost power.  Now the power status for unit one is off and I can't get any POE device to power up from the switch.   Is there a command that will turn the power on?  What would cause the power to be turned off without some one specifically shutting it off.  What can I do to troubleshoot?   The power management mode was originally Dynamic and I changed it to Class to see if that made a difference.

The AP will power up if I use a power injector, so I don't think the problem is with the AP.

The unit status from the CLI command is below.

Thanks

Dean

IHR_N3024PR#show power inline

Unit Status
===========

Unit........................................... 1
Power.......................................... Off
Total Power.................................... 550 Watts
Threshold Power................................ 495 Watts
Consumed Power................................. 0 Watts
Usage Threshold................................ 90%
Power Management Mode.......................... Class
Power Detection Mode........................... dot3af+legacy

Unit........................................... 2
Power.......................................... Off
Total Power.................................... 550 Watts
Threshold Power................................ 495 Watts
Consumed Power................................. 0 Watts
Usage Threshold................................ 90%
Power Management Mode.......................... Class
Power Detection Mode........................... dot3af+legacy