The blender render does give color but not the cycle. How could this be? Is it maybe because of my GPU? (wich i cant select as compute device)
First of all: using CPU or GPU would not make any difference on the characteristics of the rendered image, other than rendering faster or slower.
I see three possible reasons why you have a black and white image:
You set up materials in blender internal and didn't create materials for cycles.
When no materials are present cycles will render everything with the default material, which is gray.
Cycles and Blender internal's materials are not compatible or interchangeable. you need to create new ones them using material nodes.
As Cegaton pointed out, this happens, when you update a scene from blender internal to cycles.
All materials are lost and replaced by a placeholder material that renders gray.
Just go to material tab and start creating new materials.
Edit: I have to correct myself: It is not the case, at least diffuse color is transfered.
Here is a simple scene in blender internal
Same in cycles
The main problem seems to be missing material nodes in Cycles. I'll suggest reading the Blender Manual for materials and nodes in Cycles here: https://www.blender.org/manual/render/cycles/nodes/introduction.html.