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is it possible to change the logic board/motherboard? I am looking to convert to intel is this possible as currently I am unable to run virtualbox and other applications
If you want to run intel, you cannot without modding and making a hackintosh, which isnt easy and could cost as much as a new pc would. You can change the board but you can only go to power pc which is what you already have, so that wouldnt do anything. If you want virtual machines, get either a newer mac or a windows pc, that mac is old and considered obsolete.