I am having problems with my wired connections working.

I installed 10.10, and the wireless on a Lenovo C200 all in one works great.

The wired did not.

I upgraded to 11.04, and the wired connect seemed to be repaired. That was 3 days ago. I come in today and the 2 PC's that were working Friday now only connect via Wireless again.

I installed 11.04 on a 3rd machine, that I am on right now, and the wired connection is working. I am afraid that this connection will cease working in a day or so.

I use these PC's at work, and must only use wired connections for security.

I have tinkered with DHCP and Static, and noting resolves the wired issues. Wireless works great... ironically.

Any ideas???