I have the same issue of the server boot hanging at the acpitabl.dat in safe mode. I have gone through the suggestions in other threads, removing updates, replacing the update.sys and the bios does not have ACPI settings. Nothing helps. Here is my exact situation
New Customer with a HP ML310 running SBS 2003 R2 completely updated. The 2nd partition of the raid 1 array was filled preventing them from saving files to the shared location. Plan was to upgrade the server to bigger drives. Normally not a problem. Here is what problems I have discovered. First, no backup. I created a complete system backup of OS and data on to a USB Drive. Next I ghosted the server OS for safety. After ghosting the server was not able to boot, hanging as described. I restored the ghost to the new drives, and of course those won't boot either. Next step was to load clean OS to drives and restore the backup. Well to my surprise the restore environment does not have the drivers for the raid so it cannot access the disks to perform the restore.
Basically I am between a rock and hard place. Any suggestions that would help me get the old OS booting would be great. If not, suggestions on how to save as much as I can from the old disks or backup.