Let me know if I got that right:
If I use the HDMI output for the picture output I can NOT use the fiber optic cable in parallel to output sound to my 990?

This would really suck as you can not output 1080P through the component cables! That would mean you either have to sacrifice picture or sound quality.

Now the question is if I can route the HDMI into the TV and use the optical output form the TV to wire the sound signal to the 990?!

Another option might be to go HDMI out (PS3) to DVI in (990) and then DVI out (990) to HDMI in (TV) but I am not sure if the DVI input of the 990 is good for sound signal?!

This is getting more complicated than I thought. Thanks for all your help!