I recently purchased 3 BrickPis for my classroom (2 have arrived thus far). I purchased the kit that includes the ready to go SD cards. I built the Pis following the instructions online and was able to connect 1 BrickPi to the HDMI cable and projector in my classroom once. This BrickPi no longer connects to any monitor I hook it up to and the other BrickPi I have never got a monitor to sense.
I have read through the forums and found advice given to other people about connecting the BrickPi first and then powering it up. I am using the BrickPi microusb charger and the lights are turned on. Any next steps would be extremely helpful as my students and I are dying to use these!
Thanks for your help