MV Not Working

Hi all! New to the forum, so go easy on me.

I recently purchased a new MV to use for control/output, but it wouldn’t power on properly. Installed and reinstalled the drivers, but all I would get was a blinking green LED on the back of the unit. I’ve used the same model of unit a few times with my MacBook, so I figured something was wrong. Contacted my vendor, they sent a replacement right away. Got it today and it’s behaving exactly the same way. They’re overnighting me a third unit.

While I do get a blinking green LED on the back, I get no backlights behind the buttons and no DMX output. I opened up the System Information to see if the unit is even showing up on the hardware side and it is not. Again, I’ve successfully used a different MV unit with my MBP before, and I’ve checked my logs to confirm that I’ve had no OS updates since then. Currently running Mojave on both laptops.

Troubleshooting Steps Taken:
Tried on a MacBook Pro, and a MacBook Air
PRAM Reset on the MBP (MBA won’t let me for some reason)
Tried with 2 different MV units
Tried with 3 different USB cables
Updated from V3 R1 to V3 R2 on MBP (need to try on MBA, although I’m not feeling optimistic)
Unplugged and plugged in the unit(s)
Held red and yellow buttons during bootup to try for firmware update

Not sure what to do next at this point. I don’t feel like the issue is with the units, but I don’t know what else could be the cause. Thanks in advance