Checklists for software errors, setup, and tool workflows.

Fix Windows Defender Service Not Starting Error

If you see an error that Windows Defender won't start—or the service stops immediately—it's usual...

Fix Windows Update Black Screen After Restart

After installing a Windows update and restarting, a black screen (with or without a cursor) can b...

How to Fix Windows Defender Firewall Blocked App

You try to open an app, but it either won't start or can't connect to the internet. A common caus...

Fix OBS Black Screen with No Source Detected

If you're seeing a black screen in OBS and the message 'No source detected,' you're not alone. Th...

How to Fix Outlook Authentication Failed Error

You open Outlook, try to send or receive email, and get an authentication failed error. The progr...

Fix Outlook Blank Screen After Office Installation

Symptom and likely cause

After installing or updating Microsoft Office, Outlook may open ...