No sign of life.

Hey, I got my Beagle Bone Black yesterday with a 3.5 touch lcd cape. I tried using the cape it booted file and I tried the usb host mode which also worked fine (Of which then i installed the drivers). After this I tried one of these methods again and my beagle board wouldn’t give me any output, I then connected it via a hdmi cable to my monitor which till didn’t seem to help. Finally I decided to connect to it my pc to try and find out what the problem was but its no longer showing up on my PC. When I plug it into the mains and my pc several of the LEDs light up but other than that noting else seems to be happening.
Can someone help me figure out what’s wrong?

Thanks for any help you might be able to give.