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HDMI Mode

If the HDMI signal fails when playing a video, set the right HDMI Mode manually.
http://www.raspberrypi.org/forums/viewtopic.php?f=28&t=7513
http://elinux.org/RPiconfig
http://en.wikipedia.org/wiki/Extended_Display_Identification_Data#CEA-861-E

Check the current HDMI state:

$ tvservice -s

List of CEA supported modes:

$ tvservice –m CEA

List of DMT supported modes:

$ tvservice –m DMT

Choose the prefered mode, DMT work best with HDMI beamer and monitors:

(prefer) mode 85: 1280x720 @ 60Hz 16:9, clock:74MHz progressive

Open config file:

$ sudo nano /boot/config.txt

Change:

hdmi_group=2
hdmi_mode=85

Low level changes for DMT 640×480 60 Hz would be:

hdmi_group=2
hdmi_mode=4

If nothing helps set the HDMI save mode to try to boot with maximum hdmi compatibility. This is the same as the combination of: hdmi_force_hotplug=1, hdmi_ignore_edid=0xa5000080, config_hdmi_boost=4, hdmi_group=2, hdmi_mode=4, disable_overscan=0, overscan_left=24, overscan_right=24, overscan_top=24, overscan_bottom=24

hdmi_safe=1

Reboot:

$ sudo reboot