All my 20 workstations (XP, Vista and 7) this morning are doing the same thing:
It boots normaly up until the login screen, when I press CTRL ALT DELETE it goes to a Black Screen with a cursor but nothing happens, I can't even login.
It happens on all types of Safe Mode, I also tried Last Known Good Conf, same thing.
it looks like that they are infected.
You can proceed by two ways:
- Restore them using a restore point that dates before the appearance of your problem
- Perform a full scan on disks to delete all viruses, spyware and malware programs (use Safe Mode) and then perform a repair install
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Do you mean the screen can display data before the login screen? If so, it is probably virus. You may need to repair\reinstall the system.
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We are having the same issue, we have maybe a dozen Windows 7 installs across our enterprise, and most (all but 1 that I am currently aware of) are having this problem.
-It appears system files/folders/drives permissions get corrupted or changed
-When the user presses CTRL ALT DEL to login or unlock pc the screen goes blank, mouse cursor moves, but thats it
-getting to the restore mode and restoring to previous point works, but only temporarily, then it happens again (tested several consecutive previous restore points on one machine the problem kept coming back and actually got worse, by third attempt, the "Trust relationship between this workstation and the primary domain has failed"
-Symantec claimed no virus is known at this point to cause this
-One W7 machine was physically rebuilt from scratch the moment this began, installed, updated, added to domain, restarted and black screen issue hit upon first attempt to login to setup machine. (OU which this machine is member of blocks GPO inheritance). Rebuilt machine again this time disabling all windows updates as soon as possible, before initial updating began, then added to domain and that pc is working fine.
SO, is this a problem with an update or service pack 1 maybe?
We are literally about to put XP back on these boxes as they all are used by our IT staff, thus we can't support our 1100 computer environment.
Sounds like a DNS issue. Check your forwards. Black screen means its lost and not getting the DNS info to get to server. Also Flush Dns Ipconfig /flushdns. Make sure your DNS is pointed locally to the server and not the router. Also from the server side do't enable roaming profiles. Dns should be set up locally on the Server and then use forwarders or root hints depending on your DNS. DHCP should be on the server not the router.
Note the Set DNS Priority. It really helps.
Also here is a Nice set of tweaks that might help.
Hope that helps
I had this problem with a workstation - it turned out that the NT AUTHORITY\Interactive user account had been deleted. I disabled UAC and was able to resolve the issue. However, I couldn't re-add the interactive user account so I assume I would have to rebuild the workstation in order to re-enable UAC and be able to log in. Losing UAC was not a very big deal, the user actually prefers it that way, go figure.