We have seen computers with ATA Driver 1.11 on the IDE Hard Disk which may eventually cause the computer to freeze, if the computer is upgraded with a newer version of system software. Try updating the ATA Driver by using Drive Setup 1.0.4 or later.
To determine which ATA Driver your computer is using, click the hard disk icon, and choose Get Info from the File menu.
NOTE: Before installing newer system software, you should run Disk First Aid and then update the hard disk drivers.