I share this guys experience : Would anyone at HP like to take a look at my supplies?
During a weekend power-down for electrical testing, our two Proliant G5s were unplugged from the UPS and left disconnected for two days. When reconnected - I couldn't get them to start, no LEDs, no fans, nothing at all. All four power supplies seemed completely dead. Since they were out of warranty, I ordered four replacements (cursing mildly), but after 36 hours (plugged in) - all had returned to life. Environmental conditions might be one possibility, but so is NBTI wear-out in the power electronics. But the G5's are four years old - and our newer Proliant 380 G6/G7 which have a different common power supply were unaffected. It would be nice to know my power supplies will last for another two years.