Help with DVR harddrive replacement

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Help with DVR harddrive replacement

I have a tivo series 2 that my brother-in-law replaced the hard drive in.   The tivo was constantly freezing up so we finally ordered the tivo replacement drive and replaced it.

 Well now we are having another problem, the tivo keeps rebooting itself constantly.  I had never seen this happen before the drive was replaced but my husand said it started doing that about 2 weeks before we replaced the drive.

Is it more likely that it is a bad drive or that the power supply needs to be replaced too?  Any ideas or suggestions?