No can find boot medium

[mayagrafix]

I created a VM for Linux Mint yesterday and ran it more or less for a half hour while I checked out that distro. I installed it from an ISO which is on my HDD. Today, when I try to run it, this message pops up:

FATAL: Could not read from the boot medium! System halted.

The other VM's I have work OK, why is this one on the fritz?
Thanks in advance for any help.

[lmarmisa]

Are you using VirtualBox?. Open storage menu and check if virtual disk is shown there.

No problem here with VirtualBox and Linux Lint. It runs great.

Best regards,

Luis