CoreXy is only moving diagonally

So Im setting up my CoreXY printer using Marlin and Repetier Host, and no matter the plug configuration I use for the motors, the carriage only moves in diagonally. I have tried every configuration:

X                        Y
M1 forward          M2 forward          
M1 forward          M2 backward
M1 backward       M2 forward          
M1 backward       M2 backward
M2 forward          M1 forward          
M2 forward          M1 backward
M2 backward       M1 forward          
M2 backward       M1 backward

Is there something in the firmware I should try?

Also, one of my motors is mounted upside down because of how I have the printer designed. This may affect how the motors work, but I doubt it is a deal breaker.

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gmh39:
You will need to turn on CoreXY in the Marlin firmware.

-os3dp

I had the same problem. My issue turned out to be my ramps board and adrino were not pushed together tight enough.

My corexy is turned on and my Ramps and Arduino are pressed firmly together.

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greghoge.com

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Try and swap the motor connections to make sure the other motor and controller is good.

If it's only moving diagonally, that means only a single motor is turning. One of your motors or drivers is probably bad.

Lol. Figured it out. One of the motors wasn't plugged in...

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