Old blue got it's name for the blue and black color theme. The light on the gigabyte video card was blue and the motherboard looked black, so I went with it. I have 5 x 140mm generic case fans. The back fan has a blue light and the case has a light strip, so I went with the blue and black theme. I used to have an AIO watercooler that was lighted as well, but the pump went back so I removed it. It's shown in the pictures. I now have the Cooler Master Hyper 212 EVO air cooler. Just couldn't see spending AIO prices on a computer this old.