PCs draw ever more Power these days and figuring out what Power supply you have is something you'll have to do sooner rather than later. Here's how.
How to Test your Computer Power Supply By Itself - (Test if PSU is DOA)
Turn on PSU without motherboard - the 'paperclip trick', Lounge
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How to install a PSU
Helping a friend with his pc, can't find the wattage of the PSU, and can't pull it out atm to look. This is all I have to go off of but can't
Some Basics You Should Know about Power Supply Unit - MiniTool
Computer PC Power Supply Tester ATX Power Supply Tester PSU Tester, PC Power Supply Tester Computer Power Supplies ATX Connectors Power Supply Tester with LED Indicator Light, Plug & Play(20/24 Pin):
How to Install a Power Supply (PSU) in Your PC (2024)
How to measure your PC's total power consumption