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UPS goes to sleep and never powers server back on

Tas05
Occasional Visitor

UPS goes to sleep and never powers server back on

I have many ML350 G6's that I'm building at the moment and they are hooked up to HP R1500 G2 UPS via the management module. I have the problem when I test the power by removing the input power from the the UPS, it shuts the server down correctly but after 3 minutes the UPS turns off completely, no lights at all. I plug the power back in and ups doesn't come back, if I plug the power back in before the UPS goes to sleep nothing happens and the UPs still goes to sleep.

I have the newest UPS firmware and the newest management firmware and the newest version of the management agent.

Windows 2003 SP2 32 bit
latest ml350 G6 firmwares and drivers