Q: "Your computer is disabled" message after  installing Yosemite

Any help is appreciated!

I had the same problem on my iMac after I locked my iMac with 4-digit iCloud PIN.

The solution in my case was to make "Internet Recovery" (Apple Support gave me this solution):

1. Power off your Mac

2. Power on and hold Command-Alt-R buttons

3. Mac boot with EFI PIN lock (padlock icon with bar)

4. Enter your 4-digit iCloud PIN or your Apple ID password and press Enter

5. Internet Recovery process can take about 10-15 min then Mac will boot normally.

If not, call Apple Support for help

No data lost was in my case of Internet Recovery

I've been trying this solution, but whenever I type those passwords, the 'dots' go away and doesn't do anything. Any other suggestions (other than going to the Apple store?)

Do a backup, preferable 2 separate ones on 2 drives. Boot to the Recovery Volume (command - R on a restart or hold down the option/alt key during a restart and select Recovery Volume). Run Disk Utility Verify/Repair and Repair Permissions until you get no errors. Then re-install the OS.

OS X Recovery

OS X Recovery (2)

Thanks. It works.