I was copied data to a USB hard drive so I could re-image my EX470 when it died. My APC UPS was buzzing to no end. The HP EX470 had no power. I removed it from the UPS and plugged it into the wall and still no power. Called HP and tech asked if the unit was plugged into a UPS which I took him it was. He then told me that the EX470/EX475 are having problems with UPS. He claimed that Win2003 was not designed for UPS. So I hasked him if I should take the 19 HP DL380's running Win2003 off their UPS. That shut him up. They are trying to blame the OS instead of their power supply.