Black screen after initial asrock screen

[BenHernancez]

This is the first computer I try to build. It's not going very well so far...

These are the components:

-Intel Core i3 4150
-Asrock B85M DGS Motherboard
-Crucial Ballisitix Sport 8gb Ram Set
-Seagate Barracuda 1TB HDD
-Power Color Radeon R9 285
-Bitfenix Neos ATX Mid Tower

When I boot it I get the Asrock screen, then the following options:

F2 or DEL to run UEFI Setup
F6 for Instant Flash
F11 for Boot Menu
Tab to Switch Screen

The problem is that when I press any of these keys I just get a black screen.

I have no idea what to do so any help would be very appreciated.

Thanks.

 

[popatim]

See what happens with your display cable connected to the integrated GPU. It sounds like you have not disabled it in the bios yet.

 

[BenHernancez]

See what happens with your display cable connected to the integrated GPU. It sounds like you have not disabled it in the bios yet.

Thanks for your answer. How can I access the bios to disable this? When I press f2 the screen goes black...

 

[BenHernancez]

I don't know if this is going to make the problem more evident but I just realised that Caps Lock or Num Lock LED's do nothing when pressed during the POST.

I have tried this keyboard in a second computer and it works fine so it looks like, whatever the problem is, it is preventing the keyboard to work.

Help, please.