@sourcaffeine Well if these 60 computers are all identical besides the HDD, then taking an image from one that deployed correctly isn’t going to prove or disprove anything, because the original image also deployed correctly on some of these systems.
For a sanity check, check the free space on the server, look for partitions that have 100% use:
df -h
The error you gave in the OP, that’s not the one that is typically given when the FOG Client is causing the issue. The error literally says “could not complete the installation…” The installation of what? My guess? Drivers, maybe some weird attached device like a scanner or printer or flash drive or SD Card, we’ve actually seen times where an SD card that people left in laptops will cause issues for capture/deploy sometimes.
But, I’m going to guess drivers.
There’s some simple troubleshooting to figure out what’s going on.
To test if it’s the FOG Client causing the issue (which I don’t think it is), just delete these 60 hosts from fog, and manually using the boot menu do “Image Deploy” with the correct image. When the computers boot after imaging, the FOG Client will communicate with the server but not get any commands to do anything in this case. If this works fine consistently, then the FOG Client is probably not disabled on your reference image. If this doesn’t make a difference and the systems are still having issues booting after imaging, it’s probably at that point that it’s a driver related issue like @george1421 said, and I’d follow his advice.
Another very simple thing it could be - mismatched HDD operation modes in the firmware, and mixed operation modes, or the image is BIOS but some of the machines are in UEFI mode in firmware.