Complete Computer Diagnosis Video 48 min Carey Holzman
PC Diagnosis and Repair Video 1hour Video  Carey Holzman
The Definitive Guide to Troubleshooting USB
How To Power Supply Reference
OnePCBSolution –  Replacement HDD PCBs
Diagnosing And Fixing Motherboard Faults
How to Fix Your Motherboard for $15
Having Problems With Video Card? Stress Test Its Memory!
How to benchmark your PC: test your computer’s performance
Proper PC Diagnostics⁄Safeguards When Working on a PC
Pictorial Power Supply Reference
How to Tell If Your Computer is Overheating and What to Do About It
How to Identify Which Hardware Component is Failing in Your Computer
How to Tell a Hardware Problem From a Software Problem
How Can I Test My Computer’s Power Supply?
How do You Find Out Which Computer Fan is Being Loud?
Major Hard Disk Problems and Their Solutions
Troubleshoot Keyboard and Mouse Not Working in Windows
Troubleshooting Videos with Professor Messer
How to Check a Drive for Errors in Windows 10

Manufacturer’s hard drive tests that run inside of Windows
Western Digitalhttp:⁄⁄⁄product⁄download.asp?lang=en
If uncertain about model, try this one:  http:⁄⁄⁄product⁄download.asp?groupid=608&sid=3&lang=en
SeagateTutorial:  http:⁄⁄⁄articles⁄en_US⁄FAQ⁄202435en
Toshibahttp:⁄⁄⁄storage-services-support⁄warranty-support⁄software-utilitiesFujitsu – sold to Toshiba on 01 Oct 2009.  No tests available AFAIK.  Use the SeaGate SeaTools for Vista and newer systems, use Hitachi DFT for XP and older systems.  Thanks to MvdB:  You can find RMA info, warranty info AND diagnostics for the Fujitsu drives here.
Samsunghttp:⁄⁄⁄content⁄samsung-en-us  AFAIK, no Windows diagnostic tests are offered for these drives through Seagate
IBM – IBM has merged with Hitachi.  Use the Hitachi Windows DFT (Drive Fitness Test) listed above.
All SSD’s – generally not available.  If available, it’ll be located somewhere on the SSD manufacturer’s support website.
Generic Testers:
Crystal Mark (free) – primarily for testing SSD’s (actually a benchmarking software):  http:⁄⁄⁄software⁄index-e.html
HDTune (free) – primarily for testing HDD’s (just plain HD Tune, NOT HD Tune Pro):  http:⁄⁄⁄download.html