What I don't understand is how it happened. Both computers are daily use machines, never turned off (but rebooted once in awhile) that have never been disconnected long enough for the machine passwords to get out of sync.
Check your event viewer on the server, look especially for DNS errors, DHCP errors and Journal wrap errors. I have seen combinations of all three and almost any two cause this behavior. Easiest fix till you get the server squared away, drop out of the domain and join a workgroup, reboot, rejoin domain. Don't let them reboot again until you get the server fixed.
If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.
Computer account disabled?
I logged on as local admin and got IP address, internet access, etc.
Active Directory Manager did not show computer account disabled.
I fixed it by:
From the computer, remove from domain, restart, rename computer, restart ...
From Active Directory Manager: create new AD computer account, delete old account ...
From the computer: Join domain, restart, rename computer to old name, restart.
What causes this? Is there an easier way to fix it in the future?