I had a Chooser error on my "BlueSCSI hda image disk setup" and restarted. I got a Sad Mac. I tried the same disk also on BasiliskII...but also a Sad mac. Anyone knows what to do? Is it possible to delete something so the disk is usable or should I just make another disk?
Try using Disk Jockey to open the image. If it's just the driver partition that's messed up, then you should be able to extract the HFS partition and reuse it.
Or another possibility, use Disk Jockey to extract the HFS partition, mount that (but don't try to boot from it) in Basilisk II, and replace the System Folder. You might also need to run Disk First Aid on it.
Boot from another disk image in Basilisk II with your bad image also loaded (it will boot from the first image in the list). See if it mounts like that.