My iMac keeps locking up, but the cursor remains moveable. No pattern that I can see, it sometimes occurs soon after starting up, other times apparently random. Mail is set to load on start-up. The freeze often occurs with this, but can be any other app, e.g skype. Any suggestions anyone please?
command-option-esc keys will quit the offending program. Reboot whil holding down the command-r keys into the Recovery Dsik. select Disk Utility and then select your hard drive from the left side column and then select Repair Disk.