OK, so I just a new Radeon R5 220 for a new build, but when I installed it to the motherboard and turned the PC on, it caused the PC to not fully boot. Whether I had the monitor plugged in to the GPU or the motherboard, as long as it was installed to the motherboard, nothing would come on screen when turning on the PC. Everything internally would turn on a work perfectly fine, no random turn offs, no beeping. Like a "lights are on but nobody's home" kind of thing. Once I figured out that was causing it, I removed it and the PC started up just fine, which is weird in itself, but after I got Windows 7 installed, I turned off the PC, reinstalled the GPU into the motherboard, turned it back on, same thing. I then removed it and my PC turned on just fine. So I decided to just install the GPU drivers first, but the drivers wouldn't install from the disc, so I found it online. Everything seemed to be going ok, but then it said it couldn't detect any Radeon hardware. So I reinstalled the GPU and downloaded the driver again and it STILL said no Radeon hardware detected. Everything else works, hence the PC starting up just fine without it and me being able to type this. My recommended PSU size is 450, I'm using a 650, so it can't be that. Did Best Buy sell me a defective GPU, or is there something I'm missing?