Thanks very much for the feedback. Knowing that the software side was OK allowed me to concentrate on the hardware, and I figured it out. It seems that there's an issue with the DVI-D port. It works fine in Windows and Clover, but during the El Capitan boot process there's some video signal reset (seen as video distortion in HDMI connections) and then it stops sending a video signal to the monitor, although the OS continues to boot normally. (I confirmed this because I was able to blindly type the keyboard shortcuts to shut Mac OS X down.) The workaround is to use one of the HDMI ports instead of the DVI-D port. Thankfully I had an HDMI-to-DVI cable because my monitor does not have an HDMI port I'd like other people to test my results with the DVI-D port, and if this is a consistent problem it should probably be mentioned in the guide. Just try to connect your Hackintosh using the DVI-D port on a DVI monitor (don't use HDMI on either end) and post your results. Also please report your motherboard version (rev 1.0 or rev 2.0) and firmware version (e.g. F7).