Rest assured, the lack of fast ram has nothing to do with resolutions. Assuming the floppy disk is really readable (and not a game disk), then your floppy drive is either dirty, not connected properly (cable loose or not attached), or mechanically messed up. There is a 3.5" Cleaning floppy that uses just isopropyl alcohol on a stiff cloth disk for cleaning the heads; this is easier than getting inbetween the heads with something similar. Cotton swabs are too big unless you disassemble the drive, and can leave behind cotton fibers.
Or you could get a new or used replacement drive. There are some on *Bay out of Canada, or for about the same wait, AmigaKit has them.
Oh WorkBench will run without the floppy
