I just built a desktop for my neighbor. When I tried to start it, nothing happened. No motherboard lights, no power supply fan, no nothing. Power supply cord is good and giving 120+ volts. EATX voltages are 0 with multi volt meter. Is there anything else I could check to see if the power supply is bad? I've done several builds, but I'm still a newbie when it comes to hardware troubleshooting. I hate to buy another power supply if this one is still good, and I don't have any unused motherboards around.
AMD Ryzen 5 3400 G
Asus PRIME B450M-A/CSM Micro ATX AM4 Motherboard
G.SKILL Ripjaws V 16GB (2 x 8GB) 288-Pin DDR4 SDRAM DDR4 3200 Memory
Western Digital NVMe M.2 2280 500GB Internal Solid State Drive