We've been having trouble with Backup Exec 10d as described in http://seer.entsupport.symantec.com/docs/280671.htm, and following the recommended course of action installed KB940349. Upon attempting a reboot as required, the server begins booting (the progress bar starts scrolling), but after a few seconds the server reboots.
Attempting to boot into safe mode results in similar behavior: the usual list of drivers, etc. scroll by until it reaches 'acpitabl.dat', at which point the server pauses for a few seconds and then reboots.
Loading "Last known good configuration" does not produce different results.
Any ideas?