Having a problem with power supplies - the system reports PSU Mismatch detected on each boot and disables one power supply.  The machine has a pair of 1100w AC power supplies, and I have now tried THREE different ones; hardware revisions A01, A02 and now also A00.  All 3 have been patched to the current firmware releases, but no matter which combination of power supplies, the chassis reports a mismatch and disables one.  Each power supply works by itself without problems but when connected together, the newer hardware revision is always disabled no matter which socket, A00>A01>A02.  Is this a known issue with the R720 chassis?  It appears the only solution is to exchange or replace the power supplies and ensure we have only two the same.