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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?

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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
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2 Answers

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.

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Yeah, pretty sure it's toast –  Tom Jun 12 '12 at 17:58
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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.)

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