Prusa i3 stops when hitting end stop, motors respond not well

Hey all,

I'm building a Prusa i3 Rework and encounter a few problems with it.
I hope someone can help me with it

I'm building the i3 with a Minitronics mainboard.

When i've connected the board to my computer and connect with Pronterface, the motor's don't respond immediatly.
When i press left (doesn't matter wich carriage) it does nothing, when i press right it moves.
This is everytime the printer is connected, with every carriage.
I've installed a new firmware but it doesn't solve the problem.
Also, when the motor's respond, it doesn't move the amount I tell it to.
It seems as the motor has a maximum it can move, like there is already a end stop in the motor

I also have a Solidoodle 2, but the mainboard has become faulty, so i can't use the Z-axis anymore.
The mainboard is to expensive to replace (225 Euro's is a bit too much).
Everything else works, so i can test the motor's and they all respond perfectly when connected.

Also, when I can move a carriage and it hits a end stop, I hear a USB disconnect sound coming from my pc and Pronterface disconnects.
I use only the microswitch end stop, not the opto end stop.
The error i get everytime is:

Connecting...
start
Printer is now online.
echo: External Reset
Marlin 1.0.0
echo: Last Updated: Jun 26 2015 22:10:56 | Author: (none, default config)
Compiled: Jun 26 2015
echo: Free Memory: 4103  PlannerBufferBytes: 1232
echo:Hardcoded Default Settings Loaded
echoteps per unit:
echo:  M92 X157.48 Y157.48 Z5120.00 E1140.00
echo:Maximum feedrates (mm/s):
echo:  M203 X1000.00 Y1000.00 Z500.00 E500.00
echo:Maximum Acceleration (mm/s2):
echo:  M201 X9000 Y9000 Z100 E10000
echo:Acceleration: S=acceleration, T=retract acceleration
echo:  M204 S3000.00 T3000.00
echo:Advanced variables: S=Min feedrate (mm/s), T=Min travel feedrate (mm/s), B=minimum segment time (ms), X=maximum XY jerk (mm/s),  Z=maximum Z jerk (mm/s),  E=maximum E jerk (mm/s)
echo:  M205 S0.00 T0.00 B20000 X20.00 Z0.40 E5.00
echo:Home offset (mm):
echo:  M206 X0.00 Y0.00 Z0.00
echoID settings:
echo:   M301 P22.20 I1.08 D114.00
echoD init fail
[ERROR] Can't read from printer (disconnected?) (SerialException): call to ClearCommError failed
[ERROR] Can't write to printer (disconnected?) (SerialException): WriteFile failed ([Error 5] Access is denied.)
[ERROR] Can't write to printer (disconnected?) (SerialException): WriteFile failed ([Error 5] Access is denied.)
[ERROR] Can't write to printer (disconnected?) (SerialException): WriteFile failed ([Error 5] Access is denied.)
[ERROR] Can't write to printer (disconnected?) (SerialException): WriteFile failed ([Error 5] Access is denied.)
[ERROR] Can't write to printer (disconnected?) (SerialException): WriteFile failed ([Error 5] Access is denied.)
[ERROR] Disconnecting after 4 failed writes.
Disconnected.

After that the LED's on the mainboard are off and won't turn on, only when i remove the power and USB cable.

I really don't know what the problem is.
Is it a motherboard issue, is it a connection problem, is the firmware faulty?

Edited 1 time(s). Last edit at 06/27/2015 05:02PM by Qubus.

You sure have the endstops wired incorrectly, causing a shortcut!

Have you seen this?
reprap/wiki/minitronics
-Olaf