It was like any other day while I was working on the computer, while my PC suddenly shut down. I tried turning it back on, but nothing. So, I opened up the case and noticed that when I press the power button, not even the motherboard fan starts spinning. I stripped down everything from the system and tried running it. It worked flawlessly. So, after putting everything back on, one by one, the culprit turned out to be the Graphics card. The computer would turn on with the card inserted into the PCI slot. Whenever I would place it in there (not even connected with the VGA cable, just plugged in the slot), the motherboard would refuse to start up. So, I decided to check the GPU for cylinder holes, but everything seemed to be intact, no burnt smell, or anything. The PC works just fine with the integrated graphics. Can it really just die like that without a proper reason? It wasn't over-heating, I had that one checked. So, what should I do right now? I don't have a spare GPU to check if it's the PCI slot that's the problem or the GPU, which was fine like 10 minutes ago.