Have a Dell Poweredge 2800 that randomly reboots.
Running Server 2003 R2 with 1 CPU and 2 GB Ram. No suspicious events in the Windows event logs.
The OpenManage Embedded System Management Log has several of these errors:
PROC_1 Status processor sensor IERR
PROC_1 Status processor sensor recovered from IERR
All other components are healthy.
Bios, BCM and Backplane firmware are already up to date.
Tried re-seating the CPU and applying new thermal grease, ran Memtest and Dell offline diagnostics - all pass.