I do miss the one trick you needed to know to fix most any issue, just blow on the cartridge and everything is good to go. Today you problem solve and end up doing what a lot of people ended up doing, resetting to factory default or purchasing HDMI cables etcetera only to find out the issue wasn't on your end.
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“Do not fear to be eccentric in opinion, for every opinion now accepted was once eccentric.” ― Bertrand Russell