You bought the A1200 and the HD seperately, right? Someone else installed a generic OS 3.9?
I haven't installed 3.9 for years now and haven't tried it on 1200s yet (future project). IIRC, 3.9 has many eye-candy enhansements (a new demanding icon display engine, etc) aimed at fast processors, lots of ram, and especially retargetable graphics. AGA is a bit underpowered for all the abilities of 3.9
It might be easiest to re-install 3.9 for all your hardware married into one system before you get invested installing all your apps on top, if you have the 3.9 CD handy.
Something to think about.
