As the office will never pay for deep forensics we use system restore to when it worked or restore from it's image backup.
Yes, you can google this one for more ideas but I'm guessing your office is like ours and will not allow deep investigations.
I have an XP machine on an active directory domain. The box had been working fine until a week ago. Now, when it boots up, it goes to a login screen as if it were not in a domain. You have hit Ctrl-Alt-Del twice to get to the regular domain login screen. At that point you can login and ti works like it always has, with access to all domain resources.
So far I have:
Scanned for Malware
DIsjoined and rejoined the domain
Changed the Computer Name (then disjoined/rejoined the domain)
Confirmed all network settings.
Also checked the registry for Domainlogon which has the domain name. Also under user settings the box for "Require Ctrl-Alt-Del" is checked.
I'm stumped...any ideas??