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Windows logon screen blinks and does not allow you to enter a password

Posted on 2011-09-19
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Last Modified: 2012-05-12
I have a lenovo t500 notebook.  It takes a long time to boot and when it gets to the login screen, the screen starts to blink and does not allow the user to login.  Ran in safe mode ok and disabled startup items but when I go to boot again, the screen blinks.
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Question by:jwstraugh
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10 Comments
 
LVL 5

Expert Comment

by:dumpsterdivingdave
ID: 36560828
Sounds like the video card or drivers may be to blame.  If you reboot back in safe mode and re-install the latest video card drivers, does that make any difference?
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Author Comment

by:jwstraugh
ID: 36561486
I am running the stanard VGA driver now but the screen still blinks at the logon screen and cannot login.
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LVL 5

Expert Comment

by:dumpsterdivingdave
ID: 36562117
Try the following:

Make sure the latest drivers are installed from the video card manufacturer.
Try plugging in an external monitor and see if the issue occurs on that monitor as well.

It could also be that the refresh rate on that monitor somehow got set to something not supported (like say 80Hz when the monitor can only do 60).

Another thing you can try to do is reboot in VGA mode.  This option should be on the same screen that you use to select Safe Mode.

Let me know if either of those get you any further or if you need more detailed instructions.
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LVL 66

Expert Comment

by:johnb6767
ID: 36563083
the screen starts to blink and does not allow the user to login.

Do you not see the logon dialog?
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LVL 66

Expert Comment

by:johnb6767
ID: 36563099
And depending on the os, hit ctrl/alt/del to see if you get the classic logon...

And since it worked ok in Safe Mode (did you test VGA mode), I would disable ALL startup items, and all Non MS services....
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LVL 10

Expert Comment

by:Mohammed Rahman
ID: 36563507
Create a new TEST user through safemode and check if you can login to the test account in normal mode. Also, check the VGA mode (as johnb6767 said)
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Accepted Solution

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jwstraugh earned 0 total points
ID: 36563856
Thanks to all.  Did all the above but still blinking when the login screen comes up.  It is a Thinkpad so i restored the system from backup and it worked.  
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LVL 66

Expert Comment

by:johnb6767
ID: 36564491
Glad you are fixed....

I would go ahead and accept http:#36563856 as the answer, and begin the closing process. If anyone assisted you to this solution, feel free to award based on assistance, but please not just for participation....
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Author Comment

by:jwstraugh
ID: 37028227
Did not resolve the problem.  Restored from backup
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