Best way to reformat HD on an iMac in disk utility?
Recently received a 2008 20" iMac in great working shape - just won't boot out of disk utility since previous owner erased it and thus lost the OSX Journaled Extended format. Suggestions on how to reformat? I attempted reinstalling El Capitan- it just tells me "operation can't be completed at this time."
Michael's iMac 20", iMac