It works !
The first problem was issue to a short which burn ftdi, atmega and one stepper stick...
With my new sanguinololu, the problem was from marlin firmware. To fix this I took it on reprappro github, and inverted X axis motor polarity and now it works ! (I don't really understand what was the problem)
PSU problems was a wrong approach, those I tried where undersized (300W ??), that's why it turned off when connected.
Thanks :)
The first problem was issue to a short which burn ftdi, atmega and one stepper stick...
With my new sanguinololu, the problem was from marlin firmware. To fix this I took it on reprappro github, and inverted X axis motor polarity and now it works ! (I don't really understand what was the problem)
PSU problems was a wrong approach, those I tried where undersized (300W ??), that's why it turned off when connected.
Thanks :)