Print Bed Leveling Issue

The HDMI cable going to the adapter on the touch screen <-- check that the cable is fully seated into the 90 degree adapter. I had the same issue occur the last time I removed my C2 printer front panel. The adapter only holds the cable, however it is easy for the cable to get separated from the adapter. When reseating the C2 front panel, lift the area of the front panel just above the touch screen to help avoid contacting the HDMI cable assembly.