[bitor]

Greetings:

As a last ditch effort, I would open (don't forget to pull out the black shutdown/start up button. If you don't do this you could break the case.) the snap and check the solder connections on the LAN RJ-45 female connected to the snap's mother board. If it is an old mother board, then the feet are visible and sometimes work loose/solder breaks. On mine, I basically had the same problem and re-soldered the feet and have had no problems with it.
You can also slightly press down on the top snap's RJ-45 female connector on the motherboard and set a side the hard drive enough(or use a longer ribbon) were you can have it connected then boot up to see if you get your Link LAN light on.
You can also verify that the snap's RJ-45 connector is or isn't working by using a straight though(crossover) LAN cable. Just connect one end to the snap and the other end to a PC. This is assuming you have a static IP address on the snap and you would configure a static ip on the pc you are connection with.

I have a feeling it might be the solder connection on the snap's mother board is cracked or broken connection.

example:
Snap:
192.168.1.2
255.255.255.0

PC
192.168.1.1
255.255.255.0

bitor