Fix OneDrive Sync Error 0x8004de40 – Authentication Failure
You're working on a file when OneDrive pops up an error: "Authentication failed – Error c...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listWindows Defender Setup Checklist for Small Business
If you're setting up Windows Defender for a small business, you might be wondering if the built-i...
Windows Search Not Showing Results: Quick Fixes
If your Windows Search returns no results or shows an empty list even though files exist, the sea...
Fix BitLocker Version Mismatch After a Windows Update
After a Windows update, you might see a BitLocker error like "The version of BitLocker on this dr...
How to Stop a Docker Container from Restarting
You start a Docker container, it runs for a few seconds, then stops and restarts. Or you stop it ...
Microsoft Store Sync Issues Between Devices: Fixes That Work
You buy an app on one Windows PC, but it doesn't show up on another. Or your game saves, settings...
Topic paths
Quick titles
Reset Remote Desktop Settings: Step-by-Step ChecklistResolve Outlook Loading Profile ErrorChrome Won't Start in Safe Mode: Troubleshooting GuideFix BitLocker Hanging on Boot After UpdateTroubleshooting Remote Desktop Dependency ErrorsWinSCP Permission Denied: Step-by-Step ChecklistTroubleshoot Remote Desktop Black ScreenFix OneDrive Not Syncing Despite Internet Connection