Hi, I built a computer, and tried putting Windows Vista on it. When I first turned it on to boot it, it got to the select language screen, and froze. I decided to download Ubuntu instead. I downloaded it on to a flash drive and put it in my computer. I turned on the computer, got to the screen where you choose to try or install it, and chose to install it. After a few seconds the connection between my monitor and computer stopped working. The screen went blue and a box that said HDMI No Signal appeared. Wat do?