Geeetech i3 Prusa Arduino problem

Hi everyone .Put together a Geeetech i3 Prusa clone ,its all together ,now I thought the easy bit ! Wrong , I cant get the Arduino to upload on to my Printer , it gets so far , the green down load is about 3/4 in , then it all goes orange and black lots of writng and saying def bla bla , any ideas ? : i have the right board in the Tools box , I have the right com , ist recognised both of These ,but as soon as you hit download seconds later the orange black Show . Hope you can help .

You need to capture and analyze the error message, you know the important bits that you just dismissed as "def bla bla"

My last printer would fail to upload unless I had it's power supply turned off and uploaded with only USB power. I think there was a bug with the ramps board. You could try that as well.