My 27" aluminum imac no longer recognizes its own hard drive.  i start up from the disc, but get no destination to install.  whatever am i to do???

it shows up in disc utility as "media" unable for verify or repair.  as a target disc all that appears is the install disc.  anyone else have this problem??

Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. Is your hard drive at least listed in the DU sidebar? If so, select the topmost entry (drive mfgr.'s name) and not what is displayed for the SMART status in the DU status area. If it does not say "Verified" then the drive itself has died.
I would also suggest you shut down the computer for a full minute then restart doing the above in order to see if the drive "comes to life."

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