Last night when I finally turned off my computer, I noticed the monitor was dark, and playing with the mouse didn't revive it. No great concern; I have had the computer shut down on its own sometimes before.
But this morning, when I booted, I could hear the music that told me OS4 was booting, but my monitor kept telling me to "Check HDMI cable!" I panicked. I needed to e-mail a document to a bunch of people and I could only access the documents and mailing lists from the desktop.
Unplugging and replugging the cable didn't help. Finally I was able to dig up an old VGA cable, and now I have my monitor back, but I remain very concerned. What could have gone wrong, and how should I fix it?
My first (and so far only) guess is that the video card is conking out. I took a look at it. It looks sort of glued(?) to the mother board so obviously it's not an easy thing to replace if that is what I will need to do. I assume the problem does not lie in the monitor itself (a Samsung S23C570) since it works with the VGA cable, but what do I know. I'll try to find a way to test the cable on my TV, but why would a cable go bad if I never even touch it?
Advice? Advice on where to get advice? Please?