Error for Disk repair:the underlying task reported failure on exit
iMac powers up with normal startup Chime-then gray screen with apple logo and rotating Cursor-then fan gets louder. Booted apple install disk.can't find hard drive. Disk Utility verify says the volume Mac Hd needs to be repaired. Try to repair, get message: the underlying task reported failure on exit. iMac does boot up sometimes after repeated try's.
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