erase iMac
iMac 2011 with Catalina. Control + r results in blank screen, not disk utility or erase.
iMac 27″, macOS 14.1
Question marked as
A 2011 iMac can only run up to 10.13 High Sierra.
Please double check the year model.
see > Identify your iMac model - Apple Support
Does this iMac startup and run normally..?
If not, then see > If your Mac starts up to a blank screen - Apple Support
If it does, then see > If you can't start up from macOS Recovery - Apple Support