Apple iMac (17-inch Mid 2006) - Manual (Page 135)

iMac (17-inch (Mid 2006/Late 2006 CD) Troubleshooting — Symptom Charts 13
System hangs during normal startup process
Boot from the system CD that came with the computer. Use Disk Utility to verify the hard
drive.
Using Disk Utility, reformat the hard drive.
Check all cable connections to and from the hard drive.
Replace the hard drive data cable.
Replace the hard drive.
Replace the logic board.
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