StepDiag | Interactive IT & Technical Troubleshooters

Hardware & Drivers

Ubuntu Black Screen After Nvidia Driver Install - Secure Boot Diagnostic

Comprehensive diagnostic troubleshooting tree for resolving black screen hangs, login loops, or display manager lockups on Ubuntu systems following Nvidia proprietary driver installation, kernel module loading failures, and UEFI Secure Boot blocks.

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Networking & Connectivity

SSH Connection Refused on Port 22 But Service Running - Firewall Tree

Comprehensive diagnostic troubleshooting tree for resolving 'Connection refused' errors on SSH port 22 when the SSH service is confirmed active and running. Covers local packet filters, SELinux/AppArmor policies, cloud security groups, and TCP wrapper rules.

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Operating Systems & Performance

Linux Boot Stuck at GRUB Rescue After Windows Update - Dual Boot Fix

An exhaustive, step-by-step diagnostic tree for dual-boot systems stuck at the 'grub rescue>' or 'minimal BASH-like line editing' prompt following a Windows Update. Resolves root causes ranging from EFI boot order overrides and partition UUID shifts to broken BCD bootloaders and corrupted grub.cfg files.

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Security, Malware & Access

SmartScreen Can't Be Reached Right Now Error Fix - Windows Diagnostic Guide

Exhaustive administrative diagnostic tree to troubleshoot and fix 'Windows Defender SmartScreen can't be reached right now' popup warnings caused by DNS resolution failures, cloud API endpoint blocks, corrupted Security Center app packages, or misconfigured Group Policies.

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Security, Malware & Access

Account Locked After Too Many Attempts in Microsoft 365 - Admin Unlock Tree

Exhaustive administrative diagnostic tree to resolve Microsoft 365 user account lockouts triggered by Microsoft Entra ID Smart Lockout, bad password flooding, active Directory synchronization loops, or persistent legacy protocol authentication caching.

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Networking & Connectivity

Windows 11 Wi-Fi Connected but No Internet? How to Fix It

Comprehensive diagnostic guide for Windows 11 devices showing a connected Wi-Fi icon with a globe or no internet access indicator. Covers DNS resolution failures, DHCP lease timeouts, TCP/IP stack corruption, and wireless adapter driver bugs.

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Security, Malware & Access

Google Account Suspicious Activity? How to Check for Unknown Devices

Exhaustive troubleshooting tree to audit active Google account sessions, identify unknown or compromised devices, revoke malicious OAuth API access, and secure account credentials.

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Security, Malware & Access

Microsoft Account Hacked? How to Recover and Secure Your Account

Exhaustive troubleshooting tree to regain access to a hijacked Microsoft Live/Outlook account, terminate rogue active sessions, audit connected app permissions, and prevent persistent unauthorized access.

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Hardware & Drivers

Fast Charging Not Working? How to Check USB PD and Quick Charge Support

Exhaustive root-cause troubleshooting decision tree to diagnose USB Power Delivery (USB-PD) and Qualcomm Quick Charge (QC) negotiation failures, CC line resistance faults, thermal power throttling, and physical receptacle contamination across mobile devices and laptops.

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Hardware & Drivers

Laptop Using Integrated Graphics Instead of Dedicated GPU? Here's How to Fix It

Comprehensive diagnostic guide to resolve hybrid graphics switching failures, OEM driver conflicts, BIOS MUX switch misconfigurations, and application-specific GPU assignment errors.

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