Motherboard: ASrock Z390 Steel Legend PSU: Corsair RM650 PCI-E Card: https://www.amazon.de/gp/product/B002RL8V7E/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 When this card is plugged in, the power LED of my PC chassis - which would normally turn off when the computer is shut down - doesn't turn off. Also both CPU_LED and RAM_LED turn red on the mainboard, when the PC is shut down. It doesn't matter if anything is plugged in into the PCI-E card. I normally wanted to try to use it for the mouse. Also, I didn't plug anything to the card for the power - it works without any cable. If I wanted to try, what kind of cable would I need? Thanks.