Power Issue ML310 G3

[Jacen]

A client's server has recently started to shut itself off and they cannot power it back on by pressing the power button, they have to pull the power cord and then plug it back in on the back of the server.  This server is plugged into a UPS, which has a new Proliant server plugged in as well (don't have the model handy for the second server) and the newer server doesn't go down.

When looking at the logs the only thing we see is:

Server power removed

On-board clock set; was previously [NOT SET]

Power restored to iLO2

The G3 is an older server and this has just started to happen, so any recommendations on what we can look at would be helpful.

Thanks in advance

JT