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Re: My Apple ][+ is now very, very sad...

I'm wondering if your II+ isn't flipping between different video modes,
erratically, but rapidly.

Maybe try typing these commands, since you are able to run programs:
HGR
HGR2
TEXT

If this changes the display any, try this:

POKE 28,127
POKE 230,32
CALL 62454

Any change?

POKE 230, 64
CALL 62454

On the off-chance that the video mode isn't stable, some of these might
change what you see.  If they do, this should help zero in on which chips
are malfunctioning.

Jerry