I have a G4 AGP. It has Radeon 9000 card 160G startup drive with an additional 20G drive Runs 23" cinema display Runs Tiger Presto Gigabyte ethernet card I'm finally ready to install my NEW Mercury processor (1.5Ghz) with copper heatsync. Sounds goood, right? THEN to my disgust I find out that I HAVE to HAVE OS9 installed to detect which firmware I'm running, and that I CANNOT DETECT this with OSX. So let me get this straight. I'm running Tiger. My machine is awesome. And I have to install the oh so PRIMITIVE and ANTIQUAITED OS9 just so that I can put a new processor in????? RIDICULOUS!!! Does anyone feel my pain??? Is there a way around this? Will I have to reinstall OS9 with Panther or with Tiger? Disgusting!