I am having problems after upgrading my '07 Macbook (replaced HDD with a bigger, faster one, and upgraded RAM from 2GB to 4GB). I am running Leopard, BTW. When I restart my laptop, and have either USB or FW drives plugged in, the laptop will not boot into OSX. I will get the startup bong, then one of two things will happen: either the computer will hang on the white screen, or it will start to actually boot up, but will hang up after getting the primary device uid, meaning it is not actually loading any of OSX itself (I have verbose bootup activated) If I unplug the devices before I restart, then I have no problems, it boots up (and super freaking quickly after the upgrade woohoo!) Has anyone else had this problem, and is there a quick fix for it? Thanks for the help!