Two externals stopped working, that won't work on three computers.
Unless there's a virus on your PC that kills externals and does nothing else "harmful" you should be able to Sherlock Holmes this, and find a common thread that ties this issue all together.
You said you moved.
Is there any chance that your new house is haunted?
Have you updated anything recently?
Even automatic updates from Microsoft can foul you up if you're in some crazy 1 percent group, and if it is automatic updates(which it probably isn't) that might change all the computers in your house simultaneously.
Crazy %0.0000000001 group.