Windows 10: Windows 10 Logon screen flashing/busy.

Hello, I'm new to the forum here.

I'd like to ask if anyone has had a problem with the logon screen with windows 10.
I upgraded on the morning of Saturday 8th August, without any serious problems. However, later on in the afternoon, I had to do a restart, after a virus/malware scan and removal of infections. The OS was updated at this point, after which a serious problem occurred. Once the OS reached the logon screen, it started flashing on and off between Logon screen and time/date start up picture, with the cursor showing busy. It also reported an error message to do with LogonUI .
I had no way to Logon, or to open task manager, so i had to boot into safe mode, and attempt various problem solving solutions read elsewhere for this issue on the net. None of these worked, so i had to roll back to Windows 7 for the time being. Should i upgrade again, this issue will have to be resolved.
Finally, though, i'm led to believe that LogonUI is malware, and not an important system file, but should it be removed, would this be the cause of the issue?

Any help on this subject be greatly appreciated.

:)

 

Windows 10 major update

Major update to windows 10, took ages. now accepts my logon but goes off into limbo with occasional flashes from the screen

 

cannot get past the logon screen

after windows 10 auto update, I cannot get past the logon screen. desktop flashes, then back to logon

this same thing happened a year ago after an update. don't remember how I finally got past it.

 

Error Message read:

LogonUI.exe - Application Error

The instruction at 0x00007ffa704e5b90 referenced memory at 0x0000000000000008. The memory could not be read.

Click on OK to terminate the program.

 

I experienced something similar to this. After my first reboot post Windows 10 install, the login screen just flashed, as if there was a loose connection in my VGA cable, or TV interference. The effect being I couldn't login or use my machine.

After much research trawling the 'net, it seems that 'FastAccess', a product from Sensible Vision, that came with my 3 month old Dell laptop, isn't compatible with Windows 10. Or at least the version I had isn't compatible. Sorry, I don't know which version it was.

To disable it, I had a bit of a nightmare getting into Safe Mode and could only get to a command prompt. As I wasn't able to uninstall it from the command prompt, to prevent it starting at boot I renamed the FastAccess folder within c:\Program Files (x86), giving it the extension '.old'. Actually, I can't remember if that was in a 'SensibleVision' folder. Either way, renaming either of these will have the same effect.

I rebooted and voila!, a normal login screen. As I wasn't using FastAccess and didn't want it, I uninstalled it (after removing the '.old' from the folder to allow the uninstaller to do a clean job). All now seems to work fine (I only did this a couple of days ago).

Hope this helps.

 

Thanks for the reply! As far as I'm aware, I don't have FastAccess installed on my PC. However, something on Windows is the cause, either a process, driver, or program. Finding out which one though, is the hard part...

 

Looking around for information on the net again. The issues connected to LogonUI that I'm having, have also been reported in Windows 7.

 

Man, this helps a lot. I have the same problem with my Dell. One question: how did you get to a command prompt from the login screen?

 

Shut the PC off, then reboot while pressing F8. You should then enter the safe mode menu. Choose "Safe Mode with networking" recommended. This will allow you to surf the net for more info if you need it, and allow you to use command prompt.

 

Also, BitDefender antivirus seems to be a possible cause of the flashing Logon in Windows 7. I don't have BitDefender installed, but I had something called bit BitRaider installed, which I've just removed. However, how this effects Windows 10 in the same fashion, I'm yet to ascertain.

 

I appreciate the input but I've tried that a bunch of times with no success. It boots so fast that I can't get it to take. I've even tried holding down F8 (and shift-F8) from before touching the power button all the way through to full boot. If I can get to a command prompt, I'll be fine -- I can just do what the guy above said and cripple the Dell bloatware that's causing this.

 

Just answering my own question here. I downloaded the Windows 10 media creation tool and made a bootable USB key with it. That got me into a command prompt but I found I didn't even need it as just booting to it and letting it update fixed my problems. Here's the tool that lets you make a bootable Windows 10 key.

Windows 10

 

Press ctrl+alt+del for a 10 sec and it will stop...worked for me

 

Here is the tricky solution. Try once and let me know if it works or not.

Remove your adapter while the screen is flashing and wait for 2 to 3 second. For me it is working every time.

 

I got exactly same error on my old laptop with windows 10 after update. taking out power cable worked and then I realized that this is issue appears if you have in laptop dedicated video card. In my case i have amd radeon card and laptop was trying to start it from beginning, after unplugin power source laptop switched to integrated graphic( default driver setup) So I changed in graphic driver settings to always use integrated card whatever pluged to power source or not laptop and now it starting up without blinking screen.