Macbook Pro ethernet problems

Hi All:
First post here. I have a 15" first generation MBP, and I'm having some ethernet problems. When my ethernet works, it works fine. However, if i were to shut down the machine and disconnect the ethernet cable, I cannot reconnect to the ethernet. In Network Preferences, Ethernet is not available in the pulldown and it appears gray-ed out in the Network Port Configurations. Restarting the computer, unplugging or resetting the modem doesn't help. Also, the PC link light on the modem will not be lit (but is lit when working).
The computer will not connect to any ethernet network, no matter where I am.
I've noticed if I keep resetting both comuter an modem a couple dozen times over a few hours, the PC link button will light, and upon next startup the ethernet connection will be restored. What do you guys think the problem is? It seems abnormal to me.

Had a similar situation with mine back in January, 2.16 Intel.
After spending 3 nights with my Cable ISP as the connection would drop-off, ethernet light flicker green,amber etc.
Took it back to Apple dealer, connected to Dealers network same problem. Cause:::: Motherboard had to be replaced, possible soder loose on the MO. Got it back in 10 days, haven't had a problem ever since.
Suggest you take back yours to have Apple dealer try this out.
zimer

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Message was edited by: RainWheniDie

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<E-mail Edited by Host>

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