I put the same XYZ.iso in a working guest's CD drive in Virtualbox's settings window while the guest is shut down, then I boot the guest, and this happens:

I put XYZ.iso in a new guest's CD drive in Virtualbox's settings window, then I boot the guest, and this happens: Try to start a guest with the new ISO (I find that booting with a non-bootable ISO merely gives the No Bootable Medium error, Virtualbox seems to attempt to use the ISO.) If the guest at least gets to the No Bootable Medium error, than your Virtualbox should be able to boot from ISOs and your other ISO's may be bad.Īlso, on one of your non-working XYZ.iso's give some data like this. Becca: It is possible that a file that did work once can get corrupted later.įor the green guys: Is the Boot-from-ISO requirements in Virtualbox different from the Mount-in-a-guest requirements? if not, then a guest which can accept and mount an ISO ought to be able to boot from it.īack to Becca: As a test, try downloading some ISO or other from a worthy site, especially if you can get a md5 or SHA hash on the site, too, then run a hash on your download to confirm.

Virtualbox windows 10 iso file