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<blockquote data-quote="hughvane" data-source="post: 1310920" data-attributes="member: 56231">Boot your iMac from the Install disk that came with your computer (I'm assuming you know how to do that).Open Disk Utilities from the top menu bar once the iMac has started from the optical disk. Choose First Aid &gt; Verify Disk, and let it run. If faults are found, you may be able to repair them using Repair Disk.For the external disk, should you wish to verify its hardware, be sure to choose the FIRST of its two names (possibly with a colored icon) showing in Disk Utility.The &quot;tick&quot; noise you hear has been discussed in these hardware forums, but usually in relation to laptop drives. For that very reason I changed the Fujitsu 120 hard drive in my Macbook to a 320 to get rid of the noise. The 120 is now a portable external drive - and the ticking noise is still there! I just live with it, the drive functions normally otherwise.</blockquote>

[QUOTE="hughvane, post: 1310920, member: 56231"] Boot your iMac from the Install disk that came with your computer (I'm assuming you know how to do that). Open Disk Utilities from the top menu bar once the iMac has started from the optical disk. Choose First Aid > Verify Disk, and let it run. If faults are found, you may be able to repair them using Repair Disk. For the external disk, should you wish to verify its hardware, be sure to choose the FIRST of its two names (possibly with a colored icon) showing in Disk Utility. The "tick" noise you hear has been discussed in these hardware forums, but usually in relation to laptop drives. For that very reason I changed the Fujitsu 120 hard drive in my Macbook to a 320 to get rid of the noise. The 120 is now a portable external drive - and the ticking noise is still there! I just live with it, the drive functions normally otherwise. [/QUOTE]

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