It's probably because of your graphics. The flash issues, probably the same issue: flash movies needs QE/CI, which needs a properly working Graphics Card. So you have to chase those drivers: good luck!

One more thing about the commands: i think you need only -legacy npci=0x3000, since arch=i386 would be redundant (all patched kernels are 32-bit already) and -v would make you always boot verbose (with UNIX console output), instead of that clean and beautiful apple logo.