Hello   It is held in by two pins/screws. You can see the two holes used to anchor the heat sink in the image. One of the pins/screws is missing, so the heat sink is not attached in this image. The heat sink coming detached may be the cause of the problem or it may have become detached because of the overheating.   Root cause analysis is not something that can typically be done outside of a lab. We do fault isolation troubleshooting. There are many possible causes. An external or internal electrical issue with almost any hardware could cause damage throughout the system. I would suggest monitoring, testing, and running diagnostics on hardware throughout the system and any electrical devices attached to the system(UPS, Surge protector). Thanks
Hi All -  We have experienced a strange anomaly on our Dell PowerEdge T630, which resulted in the loss of 24TB of data. I'm wondering if anyone here has experienced a hole burned through their backboard under the heat sink? (see image)  [IMAGE] We unfortunately only have this one image of the under side of the backboard which would sit against where the drives were inserted, but you can still see the damage.  This may be a dumb question, but how is the Heat sink normally attached to the back board? is it soldered on or held on by a screw(s)?  We are basically seeking any advice/recommendations anyone may know as to how this may have happened (i.e. electrical surge, bad install/improper build, too hot environment, degraded UPS backup battery, etc.) or if anyone has any experience with something similar. 
Burned Hole in Backboard of Dell Server T630