The 6200 card will crash the Mac if you install anything below 10.4.3 on it (I believe OS 9 is OK, but unaccelerated); somehow you need to install 10.4.11 on your existing 10.4 install - and the only way around that is by plugging the HD in another PPC Mac, or putting an older graphics card in. Or, install 10.5. My retail version of Tiger is thankfully 10.4.3 so works OK

JB