Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Momentary press and long press of power button does nothing.

Can get in through iLO but pressing the button there does nothing.

This started after our block had a power failure but all our servers are surge protected and no other server had this issue.

Is it a power supply problem? Any ideas?

share|improve this question
Have you physically unplugged the server for a few minutes? Also, could be a fried motherboard or power supply. Surge protection doesn't help much without some sort of line conditioning. – Hyppy Jun 12 '12 at 17:49
Just tried swapping out the power supplies and no dice, same behavior. – Tom Jun 12 '12 at 17:49
What do the iLO logs show? – Jeff Warnica Jun 12 '12 at 20:34
up vote 5 down vote accepted

You likely have a fried (something) on your motherboard. You'll need to call HP to get support or maybe even warranty replacement. Hopefully they have some diagnostic process that can help, but this is very doubtful.

Does your motherboard have replaceable voltage regulators near the processor or power supply input? One of these going bad could cause the symptoms you describe, as well.

Surge protection alone isn't enough, especially with servers. Good battery-based line conditioning is almost necessary with modern servers.

share|improve this answer
Yeah, pretty sure it's toast – Tom Jun 12 '12 at 17:58

Either the motherboard is fried or, more likely, the power distribution board.
That PD board is the piece of electronics that combines the output of both the PSU's into one feed to the motherboard. It s quite susceptible to power surges.
Some dual-PSU Proliants have this as a separate board. In other models it's integrated in the motherboard itself.

In some cases the Proliant will work fine with just one PSU, but is unstable (spontaneous reboots) or won't boot at all if both PSU's are used. In that case it is certainly the PD board. (Was a recurring issue on DL380-G4 and G5 models.)

share|improve this answer

In our company we have three server HP Proliant DL380 G7.

For one of them the button power off suddently didn't work when when did a shutdown.

We realize that the switch itself didn't have the same behavior as the two others which were working.

We unmount the small front panel where the button is, it's easy you don't need a screwwdriver.

And we saw that the switch inside was not place correctly, you can compare with the UUID button is the same type of electrical switch as the power on behind the front panel.

That's all.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.