I have just carefully completed the build of the picade arcade cabinet and also modified the config.txt to add the hdmi_force_hotplug=1 code.
However the screen seems to be defective as illlustrated in the enclosed picture album.
I have checked all connectors including the sensitive LCD ribbon cable but everything seems to be in the right order.
I have also plugged another hdmi screen to my raspberry and the retropie works OK.
Any suggestions on this?