I had a similar issue with mine,link here Turns out I blew something in the DC power line and STU at EUTRONIX(see link at top of forum)was able to fix.Maybe its nothing to do with hard drive.If you take the hard drive out and put it in the dock it should still boot up with the "no hard disc" message.If it doesnt boot then its not the drive.
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MIKE 80Gb RIO