CBM 8032, nothing on screen

Got yet another PET today - a CBM 8032 with the black bezel. In my PET collection I'm trying to get, instead of each model, a representative of each body style - and there seems to be no shortage of that. Of the five I now have, each is different in some way. Anyway, I'm confident the 8032's mainboard is alive - it chirps on startup. But that's all it does. Nothing appears on the screen. I took the screen hood off - the tube lights up, so there's power and action. If I disconnect the data cable from the motherboard, I get a single dot in the center of the screen. I also have a SuperPET here, the only other unit with the larger monitor. So naturally I tried 'swapping' them - ie running the monitor leads from each to the other's motherboard and turning both on. However the SuperPET monitor doesn't come on either when connected to the 8032, and the 8032's monitor still doesn't come on even when connected to the SuperPET. Not sure what this portends - my expertise has been in the older models so far. Anyway, any advice would be appreciated.. I was hoping I'd get something by doing the swap, so I had an inlking as to what was wrong, but it appears that isn't going to happen here. Brad