UPloading Arduino

After uploading arduino the LCD stays blanck

this one:

/*
Reprap firmware based on Sprinter and grbl.
Copyright © 2011 Camiel Gubbels / Erik van der Zalm

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/.
*/

/*
This firmware is a mashup between Sprinter and grbl.
(github.com/kliment/Sprinter)
(github.com/simen/grbl/tree)

It has preliminary support for Matthew Roberts advance algorithm
reprap.org/pipermail/reprap-dev/ … 03323.html
*/

What you’re uploading is the Marlin firmware;).

Which version of Arduino did you use? (any other than the 1.0.6 version won’t work correctly, ending up most often with a corrupt uploaded firmware).

Idk, I always remove the jumper after flashing, but what if the jumper is still in place? Just an idea…

I never did remove the jumper… no issues so far.

BUT: I can compile the files on MAC-mini, but not on iMAC.
I couldn’t get it run on iMAC for any reason.

Any idea on that?