all of this sounds like a video board issue. You will have to take disassemble it and take a look at the boards. Bad caps on power boards can give you the same type of errors.
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Take a look [https://www.youtube.com/watch?v=-PdwNZMxbiA|at this video] and see if it helps with the disassembly. After that post some images of your boards etc. with your question. That way we can see what you see. https://www.ifixit.com/Guide/Adding+images+to+an+existing+question/21499
'''++@turtleman951++'''
all of this sounds like a video board issue. You will have to take disassemble it and take a look at the boards. Bad caps on power boards can give you the same type of errors.