The most common thing to break on a laptop is the harddrive, those are standardised and readily available, as are lots of other stuff that goes into it... Memory, optical drives, wire less network access, power adapter, and much more, would not be a problem to have remedied on the road. A thing which goes rather quickly on all laptops are batteries, which are difficult and expensive to come by. However, you can purchase new battery cells from a wholesaler, crack open the battery and solder in the new ones. But true, availability of parts is not the same as desktops, but in most cases you will be ok, even processors can be easily replaced by a competent computer repair man. Things that can be a bit more tricky are the lcd screen, keyboard, and such. The lap top I am using now I have built myself...
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