SUCCES
After throwing away the ethernet library and recopying it. It is now working the way it should. What an awesome computer. Thank you Fernando for all your help.
I was too early, had it working exact one time now. Now again it is not working. At least i now know it can work. So back to troubleshooting again
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If i test the response of the board. I get the right response right after it boots (1 sec after display goes on). Then later no response. Then reset response within 1 sec and later then 1 sec no more response. Tried 2 different sd-cards.
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It seems i am getting somewhere. After trying my third sd-card it started working again. So the issue seems to be sd-card related. What are the exact specs for the sd to qualify?