iMac wont BOOT!!! URGENT

My iMac has suddenly gone mad!

When I switch it on, a disk symbol comes up then the HD clicks and dies and a "?" appears on the HD symbol!!!


What do i do!!!!????

Clicking sounds from your hard drive? If it clicks its dead :dead:

If its not clicking you can try booting from cd and seeing if you can run Disk First Aid or something similar to try and fix the problem.