grbl and com port

[peace]

I was having trouble with pc to Arduino com. when I installed it everything worked fine but after a reboot there was no communication between the Arduino and the grbl software on the pc. it turned out that the com port I had chosen was being used by intel active management technology on com 3. so every time the pc booted up it would kick the Arduino out but the Arduino would still say it was active in the device manager. so I just used a different com port for the Arduino and it seems ok.