I decided to try putting more memory into my Mac II (currently at 8MB). I purchasd 4 4MB PAL SIMMs from MemoryTen and dropped them into Bank B. The first time I tried, the system started up, but only 4MB was visible. I realized that I was in  24 bit mode, so changed to 32 bit mode and restarted. I immediately got the error chimes, before any video (and no video came on). I tried reseating the new memory a few times, but nothing changed. (I put back in the original four 1MB SIMMs and everything is working as expected.) Note that  I am running System 7.1 with MODE32 and have a PMMU installed.

Any suggestions on other things to try before I contact the memory vendor about a return?

As an aside, I tried to make sure that I understood which was Bank A and Bank B, and noticed that the SIMM slots were labelled:

(Bank A)     (Bank B)

SIM4 SIM3 SIM2 SIM1

The fact that the numbering is in "reverse" order seems a little strange.

Thanks.