I recently got a 2008 Macbook air with 10.5.6 installed. It was a floor model. also, the date when i booted it up was before 2001 for some strange reason. anyway, i have a WD 320 gb passport, usb ind. power external. It worked just fine two days ago, but now i upgraded through "Software Update" and.. -It does not mount in finder, sidebar, or disc utility. -the power light turns on -cannot force mount with 3rd party software (Mount Me! 2.05) -the MBA will also not mount any SD cards!! I have tried two different cables and even my printer!! -iPod Touch works just fine in the same port -SD cards and WD Passport work fine in anything else Please Help!! I'm fairly Mac literate so give me your all!