This is power supply unit (PSU). In one job we had we diagnosed a faulty PSU
Faulty PC PSU / Power Supply) Seasonic m12 ii evo edition 80 plus bronze 520w Fully Modular Power Supply, Computers & Tech, Parts & Accessories, Other Accessories on Carousell
A Case Study in PSU Repair (Don't Try This at Home) | Tom's Hardware
Psu | Hackaday
How to Check a Power Supply: 12 Steps (with Pictures) - wikiHow
EVGA 850W P2 PSU Caught on Fire - Faulty PSU randomly ignites! : r/pcmasterrace
Is my computer power supply dead? | PC Gamer
How to Test a Power Supply (PSU) | Technical Blogs from Great Contributors
How to Know If Your Computer Power Supply (PSU) Is Failing - TurboFuture
Faulty power supply, need to replace Diode - Apple Time Capsule - iFixit
Did my faulty PSU kill my motherboard? | Overclockers UK Forums
How to Troubleshoot a PC Power Supply - Newegg Business Smart Buyer
What Happens If PSU Is Too Weak? (Explained) | WhatsaByte
Is my PSU faulty? : r/buildapc
What happens when PC power supply fails? - GameRevolution
Diagnosing a faulty PSU - YouTube
Top 10 Signs of Power Supply Failure
Own any of these faulty PSU models? Gigabyte will replace it for you - SoyaCincau
5 Signs Your Computer's Power Supply Is Failing - Logix Consulting Managed IT Support Services Seattle
3 Ways to Diagnose and Replace a Failed PC Power Supply - wikiHow