Fix OneDrive Token Expired Error (0x8004de40)
You open OneDrive and see an error like “Your token has expired” or code 0x8004de40. This usually...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Windows Update Blank Screen in Safe Mode
You boot into Safe Mode after a failed Windows Update, but the screen stays blank. This usually m...
Windows 10 Activation Troubleshooting Checklist
When Windows 10 shows an activation error, the cause is usually a recent hardware change, a corru...
BitLocker Asks for Recovery Key Every Boot: Fixes
If BitLocker asks for your recovery key every time you start your PC, something is changing betwe...
Jupyter Kernel Connection Error: Causes and Fixes
You start a Jupyter notebook, try to run a cell, and see a message like "Kernel error" or "Connec...
Fix Windows Defender Permission Denied on Ubuntu Files
You're working on Ubuntu, either in WSL or a dual-boot setup, and Windows Defender throws a 'perm...
Topic paths
Quick titles
Microsoft Teams Configuration Guide After InstallFix Windows Defender DNS Error ConfigurationMicrosoft Teams Not Connecting to Internet: Fixes to TryDebug 502 Bad Gateway Using Command PromptHow to Resolve Access Denied Errors in CMDHow to Stop Windows Update from Using 100% CPUFix Outlook Permission Denied ErrorWindows Update Configuration Hang Fix