You can sell the whole thing if pretty light as a parts machine....otherwise generally just the plastic bits that break (paper trays, the button piece, any other easily removable covers)...and I sell as a set...can and wont keep some small part around...it all goes or gets recycled if it sits too long. Now you CAN sell some boards but check the solds on ebay 1st to see the market and you need to make sure it is working of course. Otherwise boards get pulled and scrapped. Now the ones with memory, if you can get it to turn on the memory is probably ok..just CYA and say pulled from a machine that turned on but had issues, sold as is with no warranty/return...you wont get as much as you would for tested memory but I bet more than scrap value. Just do your research before keeping something that isnt selling.