The two stage supercharger was introduced on the Griffon 61 - usually indicated by a 5 bladed prop
The version in the MkXII should be either a IIB or VI variant - single stage supercharger - 4 bladed prop
From 'Jane's Fighting Aircraft of WW2' - not Wiki - lol
Jabo
Have you tried a different monitor - just to rule out the possibility.
Refresh my memory, did you swap out the power supply?
I'll dig out the 9800GTX.
Jabo
P.S. Give me a call if you can find your phone -