This problem started some months back. I would return to my desktop computer and the logon input screen would be locked. Keyboard entry or moving mouse got no response. The only solution was to hard reboot.
When I did that and returned to the logon screen, intermittently, it would refresh every few seconds, which was too fast for me to enter my Windows password that was 13 chars long. Up until yesterday (12/15, the Ides of December) another reboot would fix this problem, until it didn’t.
As this began to happen more frequently, I looked through the event logs for some clues and discovered many instances of this entry:
Log Name: Application
Source: Application Error
Date: 12/16/2021 9:57:32 AM
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: pc-03222015
Description:
Faulting application name: LogonUI.exe, version: 10.0.19041.1, time stamp: 0xc08a5452
Faulting module name: USBKeyCredentialProvider.dll_unloaded, version: 0.0.0.0, time stamp: 0x53d9fa55
Exception code: 0xc0000005
Fault offset: 0x000000000002b4a8
Faulting process id: 0xdd8
Faulting application start time: 0x01d7f26089892ecb
Faulting application path: C:\WINDOWS\system32\LogonUI.exe
Faulting module path: USBKeyCredentialProvider.dll
Report Id: 70fe25be-f782-410e-a70e-91bd79e9be0a
Faulting package full name:
Faulting package-relative application ID:
So I did some research on LogonUI.exe errors via Google , which of course produced all kinds of useless clickbait hits.
A couple of weeks back I updated to Win10 21H2 in the hopes that might fix the problem but it didn’t.
Back to Google and saw that some entries pointed to video card issues and given the input problems and the flashing logon screen, I decided to try some changes in that area.
I tried looking for video driver updates but MS says nothing was available. I next decided to try and install the native Nvidia driver but that didn’t fix the issue.
After rebooting from the driver install, I again got the periodic flashing logon screen loop but this time, there was no way to get out of it, no matter how many times I pressed various keys like ENTER.
Later when I managed to get back into the system, I discovered that each [frustrated] enter key push results in a new LogonUI event log error. A possible helpful clue?
So next, I switched to the onboard Intel video. Still couldn’t logon due to inability to enter my longish password before a screen refresh occurred.
Here’s a link to show what I was experiencing:
https://drive.google.com/file/d/1JxVn0gTFYe0tUaGw2q4fdg3Z8vxkTshU/view?usp=sharing
Next I logged into the Admin account with the brainstorm that I could eliminate the logon password for now, which should allow me to get back into the desktop and hopefully search/find a solution.
However, when I looked into this, I discovered that when I did this (or shorten the password, as I ultimately chose to do), I lose all EFS-Encrypted files (don’t have any), personal certs and passwords for websites and network resources! Damn. Is this really necessary Microsoft?
But with no other options that I could think of, I changed the account password to a single char, which should give me time to enter it before the logon screen flashes and was then able to logon to my main account of this desktop system, where I am typing this from now.
Does anyone have any ideas on what else I might try short of a system refresh?
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Running: Old ASRock z97 Extreme 6 mobo
16GB DDR3 RAM
Nvidia GTX750 video card
I7-4790K CPU
Win10 21H2 on an SSD
Plenty of free drive space