The E74 error happens because the scaler chip burns out which deals with the display to fix it all you need to do is stop the heat build up, you can do this yourself or send it in for repair
The E74 error is a general system failure. The CPU and or GPU processor chips have come unseated due to overheating and mothrboard flex issues. The motherboard will need to be reflowed by a service technician. Good luck!
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