Two weeks ago I altered some of the memory settings in the bios for
timings, refresh etc... because of crashing apps and I had problems
immediately after that.
So to clarify, you previously had (same?) problem, tried adjusting the
memory timings in the bios, which made things worse, then you wanted to
change them again but you didn't know what next to try, nor what the
defaults were? Generally there would be a setting like "normal" or
"auto", "SPD", etc, and for any other timings not set with a generic
catch-all description like one I previously gave, choose larger numbers
for slower timings, which would almost always be more likely stable.
Would it be a good idea to set bios defaults
as a way of curing the problem? I dont know what the proper settings
should be.
Generally, yes, but super socket 7 boards often had problems with AGP
video cards, it might be helpful to write down what the previous bios
settings were, particularly for the AGP port/VGA-related. If you're going
to reset the bios anyway then now might be a good time to see if you can
hunt down a bios update for the board, if one exists.
If this doesn't work, would it be a good idea to remove the existing
RAM and put another RAM stick into the machine to test it?
If you had another memory module handy, sure, but I wouldn't buy any more
memory. Something to consider is that if you have memory problems,
running the operating system may corrupt files, then you may continue to
have intermittent errors even after the memory is again working properly.
Since this seems (possibly) memory related, run
http://www.memtest86.com
for several hours.