Computer monitor not displaying anything

[Kenjinful]

Whenever I start my computer, I get a black screen. My keyboard has no response either, and my Ethernet cable has no lights. I've check to make all cables inside my computer are secure, and as far as I an see my cpu has no bent pins. All fans spin, and no wierd sounds happen. My monitor says "No signal digital" i hear no post code.

 

[Kenjinful]

I fixed it. Im not really sure how, but it works again.