diagnostics index
Fix your computer problems with clear, practical guides.
DiagMyPCHub is a step-by-step troubleshooting library for the problems everyday computers actually throw at you — hardware, Windows, macOS and Linux, software, networking, performance, startup. Every guide works the same way: diagnose first, then fix, with safe steps before risky ones.
windows · macos · linux — free, step-by-step guides
Symptom index
Common computer problems
- SYM-001startup
My computer won't turn on
available - SYM-002performance
My PC is running very slowly
available - SYM-003software
Windows keeps crashing
available - SYM-004startup
My computer keeps restarting
available - SYM-005startup
I keep getting a blue screen
available - SYM-006network
My Wi-Fi isn't working
available - SYM-007display
My monitor shows no signal
available - SYM-008hardware
My computer is overheating
available - SYM-009hardware
My USB device isn't recognized
available - SYM-010hardware
My sound isn't working
available - SYM-011software
My printer won't print
available - SYM-012hardware
My hard drive isn't detected
available
Nothing matches your current filters.
Showing 12 of 12 problems — each gets its own step-by-step guide at launch.
Categories
Troubleshooting categories
Windows
Updates, crashes, recovery tools and the day-to-day quirks of the most common OS.
Hardware
Power, fans, RAM, disks and everything you can actually touch.
Performance
Slow boots, high CPU and apps that hang — found and fixed in order.
Networking
Wi-Fi, Ethernet, DNS and the mystery of the offline machine.
Software
Installs, crashes and programs that suddenly misbehave.
Startup & Boot
No POST, boot loops, Safe Mode and the recovery options.
Drivers
Device Manager errors, updates, rollbacks and the yellow triangle.
Storage
Disks that won't mount, errors, slow drives and file system trouble.
Displays & Graphics
No signal, artifacts, GPUs and second monitors that refuse to wake.
Audio
No sound, wrong output, microphone problems and driver oddities.
Peripherals
Keyboards, mice, USB devices and printers that act out — 70 guides.
Security
Suspicious behaviour, malware basics, phishing & social engineering — plus safer everyday computing habits.
Method
How the guides work
Most "fixes" found by searching are random trial-and-error: restart, reinstall, pray. The guides on DiagMyPCHub follow the same six moves, in the same order, because a problem that's properly identified is usually half fixed.
"If it's not diagnosed, it's not fixed — it's just quieter."
-
Write down exactly what happens, when, and how often — and what you were doing when it started. A clear symptom beats five guesses, and it decides everything that follows.
-
Power, cables, a full restart, recent changes. The cheapest checks come first because they solve a surprising number of problems in about ten seconds.
-
Use the tools already on the machine: Task Manager or Activity Monitor for resources, Device Manager for hardware flags, disk utilities for storage health. The goal is evidence, not anxiety.
-
Change one thing at a time, starting with the fix that addresses the most likely cause and carries the least risk. Risky steps are labelled and always come last.
-
Reproduce the original conditions and watch over time. A problem is fixed when it stays fixed across a day of normal use, not just across one reboot.
-
When a part is failing or data is at risk, the guide stops guessing and points to the right next move: back up, replace, or hand it to a technician.
Under the hood
One machine, six failure points
Nearly every "my computer is dead" report ends up at one of these six places. This schematic shows how the future guides map symptoms to subsystems.
hover or focus a component to trace its path to the core
schematic · 6 subsystems · signals nominal
Quick reference
The format every guide opens with
| Problem | Possible cause | First thing to check |
|---|---|---|
| Computer won't start | Power issue | Power cable and outlet |
| Computer is slow | High resource usage | Task Manager (or Activity Monitor) |
| No internet | Network connection | Wi-Fi / Ethernet status |
| No display | Cable, GPU or monitor | Display connections |
| No sound | Output device or settings | Sound settings and volume mixer |
| Blue screen (BSOD) | Failing driver or hardware | The stop code on the screen |
| Computer overheats | Dust, failing fan or thermal paste | Fan noise and case temperature |
| USB device not recognized | Port, cable or driver | Try another port and cable |
Why DiagMyPCHub
Built like a service manual, written like a friend
DiagMyPCHub is being built the way a good service manual reads: calm, specific and in order. No scare tactics, no ten-tab rabbit holes — just the next sensible step for the machine in front of you.
Diagnosis before fixes
Guides follow a logical order: identify, check, test, then change one thing at a time. You'll know why each step matters, not just what to click.
Plain language, exact commands
No unexplained jargon. When a guide says open Task Manager, it shows you the keys to press — and what a healthy result looks like.
Safe steps first
Risk is ordered. Checks that can't hurt come before anything that touches drivers, disks or system files, and risky steps are labelled as such.
Every platform on the roadmap
Windows, macOS and Linux, plus hardware and networking topics that apply to any machine you can plug in.
Free, and honest about it
The library is free and ad-supported. If a tool or fix is recommended, the guide says why — no upsells, no bundled downloads.
Roadmap
What the full site will look like
This landing page is built around the URL structure the full site will use, so new guides slot in without a redesign:
/ ├─ /windows/ Windows guides & fixes ├─ /macos/ macOS guides ├─ /linux/ Linux guides ├─ /hardware/ Physical components & diagnostics ├─ /performance/ Speed, boot time, resource use ├─ /networking/ Wi-Fi, Ethernet, DNS, routers ├─ /software/ Apps, installs, crashes ├─ /startup/ Power-on, boot & recovery ├─ /storage/ Disks, SSDs, file systems ├─ /drivers/ Driver & Device Manager issues ├─ /troubleshooting/ Symptom pages — one per problem ├─ /guides/ Tutorials & deep dives └─ /privacy-policy.html
- planned
One URL per symptom
Each problem gets its own search-friendly page — "blue screen", "no internet", "won't boot".
- planned
Cross-linked categories
Related problems are linked together, so a slow PC guide can point at the storage and driver guides.
- planned
Browser-based diagnostic tools
Small tools that run on your device to check disk health, network latency and more. Nothing is uploaded.
- planned
Printable quick-reference checklists
The tables and checklists from every guide, formatted for a printed page on the desk.
- planned
Symptom search across the library
Describe the problem in your own words and land on the matching guide.
Quick checklist
Take the quick checklist
While the full library is being written, this is the pre-flight check that covers the basics behind most "something's wrong" moments. Tick the boxes, copy it, or print it — it works on any machine.