My PC Powers On Randomly—What Could Be Wrong?

I've been having a weird issue where my PC turns on by itself at random times, and I'm worried it might be due to a failing power supply. I've already replaced all the power supply cables with the originals, and I even bypassed the power button to ensure it's not that. I've checked that everything is properly seated, yet sometimes it still turns on unexpectedly. The power supply is still under warranty, but I'm not thrilled with the support here in India. Before I jump to conclusions, could there be any other reasons for this issue? I've already raised a warranty claim but it's been a month without a response, so I'm trying to cover all bases here.