For the past 2 months, my unit (purchased in Oct 2003) was rebooting during playback of a recorded show, roughly once per day. It always came up fine automatically, and nothing was lost.

Today, for the first time, the unit rebooted, I saw the Powering Up screen, and then a second later, it went dead.

The unit then had the "Record" and "Power" lights alternating (blinking) constantly. When I pulled the plug, and later plugged it back in, that same sequence happened again. The next time I pulled the plug, no lights whatsoever.

I can hear some low level whirring inside the box whenever I plug it in, but no lights, and no video.

What is the best sequence for diagnosing whether this is a power supply, hard drive, motherboard, etc.?

Thanks in advance!