Inherited an old iMac but the dvd drive just spits the OSX install disc out after a bit of clunky whirring so obviously factory reset is out. Is there a free way that I can clean up and empty this old hard drive without item by item deletion?
If you search the Apple user forum you’ll probably find an answer, and if not you can ask them.
You can try macOS recovery, if the iMac has an internet connection:
support.apple.com/en-gb/HT204904
Slàinte mhòr.