oops, link update : http://code.google.com/p/pcsx2/issues/detail?id=1094

This is a strange behavior because the game doesnt arrive the step to load the intro when both memory cards slots are empty. When you insert 2 formated memory cards the intro is loading ...

I guess tomb raider is checking for memory cards before loading the intro (as usual in the tomb raider series).

You could use a patch to skip the intro, but this doesnt solve the problem when memory cards slots are empty