It's one of those areas you learn to avoid. If you connect from VGA to VGA, HDMI to HDMI then you usually are good to go.

HDMI does have a rather bad issue with HDCP. Once in a while I find the old HDCP reset to help. It's pretty simple. Unplug the HDMI cables from the TV and then remove the mains power for about 5 or more minutes. The chips reset and then you retest.