So, i bought a used macbook pro (2,2) 15inch 4gb ram, 320gb hd, and it is in GREAT condition, looks brand new. when i saw the laptop, i made sure everything worked, even the usb ports and all is fine. when i came home, i formatted, and installed Snow Leopard, did ALL the updates before i did anything else. and i just noticed now when i plugged in my 1tb WD Passport it dosnt show up on the desktop, nor the disk utility, however the hard drive light turns on but when i put my hand on the laptop, it dosnt appear to be 'spinning' up. i tried plugging in USB stick in both USB ports and it works, shows up just fine. so i dont think it could be the usb ports.. BUT when i plug the same external hard drive on my new i7 imac it shows up. yesterday, i plugged in the same drive into a friends Mac Pro, and had no problems. but i cant seem to figure this out. any ideas?