Ok, what worked in the past? Trying new things is not a good way to troubleshoot. If we can try the exact setup you know worked before we can narrow the problem based on error messages and feedback. Trying new things is going to introduce new problems and will be a step backward.
@Chris_Miller I’ve been trying to make it work the way I always did… grbl to shapeoko… I used the same program to get my gcode… other than upgrading my java last week… that could’ve cause the issue
There is a missing piece in your description, because as I said, you can’t talk directly to grbl without some other tool. You must use something that speaks serial over USB to grbl. That’s usually either universal gcode sender, chillipeppr, or some other tool that I’m not aware of. If you can’t pinpoint that tool, I may not be able to help. Grbl communicates with your Mac via serial connection. You can’t open up Grbl without some serial based tool on your Mac.
If needs be we can hangout again sometime!
I could hangout as well depending on your time zone. I’m America/Denver so it’s getting late for me today.
@Chris_Miller I’m in Cali 9:49pm right now
@Marc_Schaefermeyer (null) yeah Marc it might come down to that… I already downloaded all the upgrades to see if that’s fixes the glitch, last time it was a matter of upgrading to the lates OS and it worked again
Ok I can hangout now for a bit but I can’t figure out how. Can you invite me somehow?
@Chris_Miller Arduino wont open the port either… 
Biggest question is what did you connect with previously? It might remember the old port that worked before. Try with that, or it’s very possible that the port ID changed. Try connecting to all of the various ports that your software lists. It seems to me it must be on your computer side if you didn’t re-flash your Arduino. I suspect your grbl is working fine but your not able to connect to it.
Is it a big deal to re-flash arduino?
@Chris_Miller I tried every port available (only two) the only one that seems like it catches with grbl is the old one… is it a big deal to re-flash arduino?
What do you mean catches? Do you see garbage or some feedback on the serial port? If you get some results with the old port, I don’t see any need to re-flash arduino. Getting some result means it’s partially working and I’d dig further down that path. What sort of result do you see, and with what software stack?
@Chris_Miller so when I connect the USB port, my MacBook reads the port, and it seems that if I push “start”, it starts sending the code to the CNC, but it won’t move at all, also when i use to connect the USB port and then connect grbl to the port, I could hear the sound of the CNC connecting to grbl, but now it doesn’t
Problem solved!!! My G-Shield and Arduino came apart some how, just had to pushed g-shield all the way back till buttom out to arduino and now its back working again :)) thanks for all the help!!
Good to hear!
@Marc_Schaefermeyer thanks Marc! :))