I had replaced the power supplies for the blade enclosures for a customer. When they had all been replaced, I noticed that one enclosure had power warning for all but two blade servers. I rebooted one thinking it would clear the alert, but it certainly did not. I researched the issue on the HP website to no avail. In desperation, I shut down the server blade completely, waited, and then restarted the server. That finally cleared the warning. I shut down the rest of the blades, and then turned them back on and all of the warnings had cleared.