Hello everyone, I have problem with PC, when i wanted to change some pc components like CPU and ram i got problem that i cant solve. My PC display black screen, no beep sounds. I tested another HDD, Same problem Graphic card is working on another PC CPU is working on another PC I cant check PSU becouse its different on another pc I tried to pull out ram memories and wipe with rubber but doesnt work What should i do right now> How can i test PSU or motherboard, i think there is a problem