Checklists for software errors, setup, and tool workflows.

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OBS Black Screen Troubleshooting Checklist

You launch OBS Studio, start a scene, and the preview shows a black screen. This is one of the mo...

MongoDB Authentication Failed: Causes and Fixes

You try to connect to MongoDB and get "Authentication failed" or similar error. This usually happ...

Fixing Nginx 404 Errors for API Endpoints

When your API returns a 404 error from Nginx but works locally, the problem is usually in the Ngi...

PowerShell Backup Restore Configuration Checklist

When a PowerShell-based backup or restore fails, the issue is often in the configuration rather t...

Fix pip SSL Certificate Error in Python on Windows, macOS, Linux

You run pip install somepackage and get an SSL certificate error: certificate ...

How to Fix WinRAR Checksum Error and Repair Corrupted Files
You download a large RAR archive, double-click to extract, and get a "Checksum error" or "CRC fai...