Computer ?

i have a Hp pavillion 500 that was given to me by a friend i tried lots of things to fix it ( cant take to a professional becuz dont have the money ) i even put fedora on it and it seemed to work for a litle bit but quit on me i have since then gone back to my old computer which is pretty outdated its a dell optiplex my question is . Can i take anything from my broken hp (memory or processor or anything like that) and install it in my dell I hate to just throw it away