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If I had to guess on the screen issue, I would say it is something in the cable that connects the screen to the motherboard. Either the cable (most are flex cables that look like copper wires in plastic film) has a break or the connection is loose. Overcrank the hinge or slightly torque it and you can get a break.
No sound sometimes can be something simple like one of the audio controls set to mute. I think my old HP laptop had some special speakers and had two or three audio controls and settings. Hit the mute on one and it affected the sound overall.
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bunch of random cars and bikes.
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