On 9/25/07, John Summerfield <[log in to unmask]> wrote: > these are all exactly the same model & revision? Same BIOS version? Yes. > Does dumping NVRAM and restoring it not work? Yes it works in that the node cleanly reboots afterwards. Unfortunately, if any of the settings are changed in order to enable PXE booting the reboot fails because of a checksum test against the checksum of the previous BIOS settings. I think I need to find a way to disable the checksum, get at the checksum to replace it or persuade it to boot with "corrupted" BIOS settings.