I would bet it's another case of bad capacitors in the power supply. I noticed my sheevaplug was dead yesterday. The green light was blinking about once a second, and the lights on the ethernet jack, yellow and green, were also blinking in sync. I took it apart, opened the power supply, and found a "bulged top" capacitor. 1000uF @ 10V.
I removed the cap and cleaned up some of the leaked fluid from it with a swab and alcohol. An old motherboard on the scrap heap had a 1000uF @ 6.3V that was the same physical size, so I stuffed it in and it came right up again.
I did measure the voltage across it and it was a 5V supply, so the 6.3V replacement was OK.
See "Capacitor Plague" on wikipedia.
I think I saw a post somewhere about a $10 replacement supply for out-of-warranty units, but I usually fix stuff myself.
Update: The $10 replacement may be rumor. It's here on plugcomputer.org "Topic: Replacement Sheevaplug power supply: What's the best thing to do?"
Thank you immensely for posting. I will open my plug later tonight and see if I could diagnose it.
Edit: I've just taken a look inside, and the psu is fine. Something on the PCB is messed up. I noticed that between the metal plate on the back of the PCB (which I assume to be the heatsink) that there is a chip without a pad. Most of the chips have a layer of some sort of material between them and the metal plate, but one of them doesnt. I think I'll cut off the plate tomorrow and see if there has been any damage to the chip.
Edit2: well, it turns out that missing piece is normal. I contacted some one else and they said that they were missing the same piece of material on the same chip. I have no clue whats wrong :/
The ethernet port's lights are always on. Even if I hit the processor reset, the LEDs dont flash or turn off like I think I recall them doing before all this. The green power light comes up, and no blue light. I also cannot access the serial console and running
sudo ../openocd -f board/sheevaplug.cfg
lucas@lucas-laptop:~/sheeva/sheevaplug-installer-v1.0/uboot/openocd/config$ ../openocd -f board/sheevaplug.cfg
Open On-Chip Debugger 0.2.0 (2009-07-26-14:56) Release
$URL: http://svn.berlios.de/svnroot/repos/openocd/tags/openocd-0.2.0/src/openocd.c $
For bug reports, read http://svn.berlios.de/svnroot/repos/openocd/trunk/BUGS
dcc downloads are enabled
Error: unable to open ftdi device: device not found
Runtime error, file "command.c", line 469:
So :/ Any ideas?