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The 'loud screeching' coming from your printer sounds like a motor, belt or fan which may be going out, have some type of obstruction or possibly has a loosened connection of some sort.
Where did he say it was his printer? I thought it was his box. And if the box is making that kind of noise, might be worthwhile to open it and listen carefully when it shuts down to determine what is causing the sound. Could be cables caught or fan rubbing or .. anything.. Or is the sound coming from the OS? (bad speakers, bad sound card)