its a gpu problem try to boot with another hdd and see wither the display is ok while going to windows.if u find any dots or colour problem with external then sure its a gpu failure.
try a reflow if not change the lcd cable screen, test another screen , reflash the bios on external.
go in windows if you like there are more basic stuff to do rather then just say its not working. HELP
ok try another screen and another cable first the go for reflow.
if you can do the reflow faster do it.
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