By any chance did you get this to work? I am trying to get the MPU to work with the Pro Micro and it just hasn’t worked out. I tried both the D2 and D3 based SCL and SDA connections, but it just shows me a blank screen as well (just says “Trying to connect to MPU …..” Like you, I too got it to work with the Uno without much fuss.
Any help will be greatly appreciated.