Command + R Process May Not Be Working on Mac.Mac Recovery Mode Not Working? Here’s Troubleshooting Guide So, if Mac recovery mode is not working and you can’t figure out why the usual Command ( ⌘) + R process has gone south, you are at the right troubleshooting guide to cut the chase. While this official troubleshooter works well most of the time, it has had its fair share of issues. Whether you are trying to fix a stubborn problem, repair/erase a hard disk, or reinstall the latest macOS version, macOS recovery (launched in 2010 with OS X 10.7 Lion) is the right way to go.