I have a Tivo HD, new in December 2009. I started having rebooting problems during most playbacks about 1 month ago, so I replaced the HDD with a new Western Digital WD10EVDS 1 TB HDD. The Tivo worked flawlessly for about 2 weeks until last night when it rebooted twice during playback. What might be going on? I guess it's possible the new HDD is going bad, but I tend to think that is unlikely. Could the power supply be bad, and if so, why would it have worked flawlessly for 2 weeks following the HDD swap, when I was previously seeing reboots every 20 - 30 minutes during playback using the old 160 GB HDD? Some details for the Western Digital WD10EVDS 1 TB HDD replacment: I disabled the Intellipark feature using wdidle3.exe, set the AAM at 128, and used WinMFS to copy over the operating system to the new drive. Thanks for your help.