Probably the first thing to check is that all the fans run when the power switch is on. If any don't, that's enough to cause a shut down. Also watch the LED's on the front. One indicates a fan problem - It's the one right in the middle. If it doesn't go off then the RMC thinks there is a fan problem.
MANX has a selection of DS10 documents which may prove hand if you don't already have them.
I referenced EK-DS10S-CR.B01 AlphaServer DS10 Console Reference for the info I just gave you.
Also good is the EK-ADS10-IP.A01 AlphaServer DS10 IPB (Illustrated Parts Breakdown) for when you need repair parts
John H. Reinhardt