Sometimes, for reasons not readily apparent, a client PC will "drop off" the domain. You'll know this because suddenly, no user will be able to log into the domain from that PC even though the NIC is active and the computer has unfettered connectivity to the switch.
When trying to join a computer to the domain, simply log onto the machine using a Local Admin account, right click on My Computer, select Properties, select the Computer Name tab, click the Change button, and retype the name of your domain in the Domain text box. Click OK twice and it will ask you to reboot this particular workstation. If you are unable to change the Domain name, an alternative solution is to switch the computer to Workgroup mode (in this same dialog box), reboot it, then switch it back to Domain mode again. In either case, the PC should now reappear in Active Directory.
The only problem is that it may not appear in the Computers bucket in Active Directory -- often times it won't be there even though it should be.
If this happens, run a search on it. Change "Users, Contacts, and Groups" to "Computers". Change the In: field to "Entire Directory". You may have to leave the Computer name: field blank and scroll through all the search results.
The computer will be found by this search even though you won't be able to find it yourself by searching through all the Active Directory buckets!
Now, you just have to right-click on that computer in the search results and select Move... . Select the bucket that this computer should go into and click OK. Now, even though you couldn't see it before, it will magically appear in the bucket you chose!
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