sdleeper

I am receiving the following event on my 2003 server. DMI Indication: Event type "Power Supply Likely to Fail" reported for Ppower Supply Group. I don't know how to proceed to troubleshoot. We have a UPS. Is this event referring to our UPS or is it referring to the power supply in our server? I did a search on Microsoft site and Google for this message and couldn't find any help. Thanks for any help.