Your firmware version 4.33f2 is fine. Of the 3 QS’es here:
an 867, a 1GHz, and a 1.67GHz (with a Sonnet processor
- thanks again Tugboat) they’re all 4.3.3f2. (Rev B boards)
Tarnish, oxidation and even corrosion inside the RAM slots is possible.
Check linked thread below for possible relevant measures… including
the Apple QS Diagnostic CD download AND Apple Hardware Test.
OS 9 seems a bit more sensitive about possible dirty RAM slots.
You could simply try switching the order of the sticks a few times,
as un-seating and re-seating the RAM can also improve connection.
But slot cleaning might be the next step. Unplug the machine and
press the power button several times to bleed remaining power
before carefully cleaning the slots with alcohol or contact cleaner.
http://macos9lives.com/smforum/index.php?topic=3784.0After cleaning RAM slots… and running diagnostics, if problem
still persists, you might try a nice clean fresh install of OS 9.2.2. -
a la Hail Mary!
Is your QS motherboard a REV-A or REV-B?