Hi, 

I have an old R710 server with an A870-00 PSU and a N870P-S0 PSU. The server has been off for a little while, but functioned perfectly fine the last time is was on. Now, I can't seem to get it to turn on. The PSU indicator lights don't light up at all, and I'm positive the outlets they're plugged in to are functioning.

I can't seem to find a BIST button on either PSU. 

What can I do to make them work?