i am having an issue with my hdmi on RPI4 retropie.  it starts up sometimes i have to take the hdmi out and plug it back in but then when i select a game to play screen goes black again.  but for the last few weeks it has been working fine until today.  i also have tried 3 different hdmi cords.  all 3 of them worked in the past.  could it be software or sd card corruption?