When you softproof the photos in Lr do they look OK? When you go to the Print Module, does the screen image of the photo to be printed look OK? Can you try printing from Photoshop to see whether the same problem occurs? All this would help isolate whether the problem is with Lr or the OS or the printer driver. It could be that in the migration something didn't migrate properly. Maybe the printer driver? Did you try uninstalling and reinstalling the printer driver? More questions and no answers here, but obviously this is not a self-evident issue and needs some further digging to isolate possible causes. I'm interested in how this works out for you because I too have been considering migrating to an SSD, but not taken the plunge yet.