Wild shots in the dark:

After plugging it in, press the power button several times in quick succession to force it to do a hard reboot. Does that fix it?

Also: Were any changes made to your network configuration since the last time it worked?

Also: Have you checked to make sure you're not infected with the Nimda virus on your home LAN? The Receiver uses HTTP, and there was a similar problem with the empeg using one of the HTTP-enabled versions of Hijack.