Troubleshooting of ramps1.4 and mega, another Newbie (no replies)

Hi All,

So I started to make my own 3d printer. I wanted to start with something easy at first - so I designed a regular x-y-z cnc table with parts I had access to and ordered most of the electronics from Robotdigg.
I wanted to put the electronics together to see if its working and I was disappointed.
So I had a:
Arduino Mega
Ramps 1.4 + LCD
steper drives
4pcs nema17, (1extruder, 3 axis)
350W PC psu

I did my best to put them together and to load the latest marlin on it(minimum changes on config.h). I haven't had any error massages on the arduino ide but when I powered up the board I have no response from it. The LCD lights up but no text. The pronterface app can't connect.

Arduino log after marlin upload:
"Sketch uses 51680 bytes (20%) of program storage space. Maximum is 253952 bytes.
Global variables use 2728 bytes (33%) of dynamic memory, leaving 5464 bytes for local variables. Maximum is 8192 bytes."

I attached some pictures from my "setup".

Can you help me? What did I do wrong? What can I do to find the error?
(Windows has a driver for my arduino mega, it is a known device)

Thanks,

RichardRahl