No wired internet or No restart.

[comlong]

Dell atitude E6420.
e1000e: Intel(R) PRO/1000 Network Driver - 1.0.2-k2

Firstly, I installed 11.04, 64 bit, I have wired internet but can not restart; then I switched to 10.04 LTS 64 bit, I can restart but I lost my wired internet.
For both situation, wireless internet works well.

I update the "linux-image-generic-lts-backport-maverick", then the wired internet works, it is fine. But, I can not restart the system, just same as 11.04.
How to fix it?

[Beacon11]

What do you mean by you "can not restart the system"?

[comlong]

Just after I click "restart", the computer would dead, no any responds.
Then I　have to hold pressing the power to shut down ubuntu.