X4170 M2 server booting problems after Patching

I recently patched 3 of my x86 servers using Patch Check Advanced. The patches all completed with no errors, but when I try to reboot the system, I get Error 37: File System Not Found. I'm fairly new to Solaris administration, but I've dug around enough to come to a suspicion that one of the GRUB files, probably menu.lst, has either been corrupted or reset to a default. All three of these servers are having the same problem. They are running Solaris 10. Is anybody else having this problem or am I the only unlucky person. Thanks for any help