I am Japanese, and am not good at describing in English.

>"+" separated numbers, some sort of quote about "then I sez...", and the
>screen goes white. At that point the disk stops all activity and there is no
>response from the keyboard or display on the monitor. The only response I

I was in the same situation.
Please set monitor to black & white by monitor control panel, and do not check 
the Change Monitor Depth in Booter.
In addition, try P-RAM clear .

Good Luck
Takeo Kuwata
Institute for Virus Research
Kyoto University