Well, I didn't take your advice. I went ahead and rebooted. No worse than it was before, however, over the last few weeks, I have had to reboot it at least 2-3 a night. It usually freezes when I try and use the other TV remote control (I have a second TV off the back, a feature of the 5200).
The hard disk is definitely corrupted. I will try and run the test overnight and see if it helps.
Is it possible to get it serviced? I would think the fact that it's obsolete would make that impossible.
If I could buy the 9242, I would, but not interested in the 9241 and although rumours are swirling around about a 9252, I can't wait forever, this thing is dying.