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Serial Port Coms don't work when shield is on.Upload Issue with Shield on

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Hey yall. This is my first project so total noob, but I am fairly tech savvy from time to time buuuut...

I have my Arduino Uno connected to my Mac. On the Uno is a CNC shield. When I tried to upload the grill to the Uno, it gave me this

Sketch uses 31244 bytes (96%) of program storage space. Maximum is 32256 bytes.
Global variables use 1633 bytes (79%) of dynamic memory, leaving 415 bytes for local variables. Maximum is 2048 bytes.
...Yada yada yada...
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00
Failed uploading: uploading error: exit status 1

So I went through the forums and I it was suggested to remove the shield and try that way. Boom. It works. Ok, cool, so I opened the serial monitor and set the baud rate to 115200 and sending $$ gave me its current settings. I set the home with $N0=G1X10F2000 and $N shows it was set up. I feeling kinda good here but when I power up the reattach the shield, I can no longer communicate with the serial window. What the actual ef. I can't send $H to home it since my serial window is not able to communicate. When I send something through it $$ or NH I get dittilly squat.

What am I missing...? Is it a weird driver thing?

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