My computer won’t turn on

My computer recently stopped working and I haven't been able to turn it on. When I press the power button, nothing happens - no lights, no signs of operation, nothing. It's a desktop computer, which I haven't had for too long. I'm reasonably sure the power cables are connected properly, since I've checked them and they seem to be fine. I'm looking for someone to look into what could be causing the issue and help me get my computer back to working order. I also pressed Reset Factory Keys in bios settings trying to turn on secure boot and it kept restarting so I tried fixing it myself. I have a feeling it has to do with my graphics card.