Power cycles on and off repeatedly

I have a MyBook Home Edition 500G drive.  It has worked great for me until the other day.  My computer didn’t recognize it, so I rebooted the drive.  Since then, I have the same problem over and over:

The drive powers up, my computer recognizes it, it starts the autoplay to search what is on the drive, and I have access to it for less than a minute.  Once I try to access files on the drive, I can hear it power down and then back up again.  It gets stuck in a loop of this until I turn it off.

It is not on long enough for me to get the 475G worth of info off it.  I am using Windows 7 Home and was originally using the firewire hook-up.  I tried the USB, no avail.  I tried on another computer, same thing.  I took the drive out of the external casing ang hooked it up directly to the PC, no good.  It always does the same cycle of giving me a little bit of access, then cycling on and off. 

I tried CHKDSK /r and it got through 4/5 of the tests. 

I want this data and am open to suggestions.

Thanks in advance,

FENN

Maybe you should try contacting WD’s Technical Support about this. You can do so either by phone or email.

To Contact WD for Technical Support
http://support.wdc.com/contact/index.asp?lang=en