Computer frozen and keyboard won’t type
i have restarted my computer three times. There is no apple logo in the left hand corner. My keyboard will not type. My mouse is working.
iMac, macOS 10.12
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Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.
NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following;
• Verifies your startup disk and attempts to repair directory issues, if needed
• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)
• Prevents Startup Items and Login Items from opening automatically
• Disables user-installed fonts
• Deletes font caches, kernel cache, and other system cache files
NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.
If you're able to get into the Safe Mode but it doesn't help the problem boot into the Recovery volume (boot with the Command + R keys held down - Intel Macs) or (How to Boot an M1 Mac into Recovery Mode), select Disk Utility and run first aid on all available volumes and reboot normally.
If that fails boot again into the Recovery volume and reinstall the system.