I have no qualms or problems opening up Macs and fixing them. My PBG4 was a refugee from a friend. It arrived with the screen not working. I fixed it, and it stills works today. I replaced hard drives, DC input modules, optical drives, memory and so on on many Macs. Generally I've found them easier to work on that any PC I've come across. Except for the original iMac, which is a right pig to get open!