I finally received all the video adaptors I needed to do the first bootup on my Pi 4. Everything went well until I decided to get the audio up and running. My research showed that I needed the 4 conductor plug, because composit video was on this connector also. So I broke out what I perceived to be the proper cable, and plugged it in. Immediately, I lost the HDMI 0 output, and there was no audio output. rats! I unplugged it, but the video would not come back. I had to shut down the Pi and bring it back up to get video back. I tried pairing it with my bluetooth headset. The headset reported being paired but, again, no audio. I tried plugging in a regular stereo cable. I had audio, but again lost the video output to HDMI 0. What am I doing wrong?