360alaska said:

Have you considered that the hard drive spinning intermittently could be a hard drive problem? I seem to have nothing but back luck with quantum drives...

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Hi there 

HD is perfect i have tried also with another hard drive , external SCSI HD and tested it on another Macintosh  , when i wrote hard drive spin intermittently mean that it seems that low voltage is powering hard drive, and computer intermittently boots and hard drive spin, then stop than spin again