Hi, David! Unfortunately, you won’t be able to swap the logic board from your MacBook Pro 15” Unibody Late 2008 or Early 2009, as Apple switches components and ports around to a point where you can’t actually fit older or newer logic boards with your MacBook Pro. I’d suggest you just buy a used newer MacBook that is compatible with the version of macOS that you would like, because it’d be more cheaper than trying to fit a newer logic board in your MacBook.

Hi, Zach! A flashing orange and green light just means that your AV cable isn't connected properly. And just a note: a Red Ring of Death (RRoD) is a variation of red blinking or solid lights around the power button on the Xbox 360, not the original Xbox.