Posting here for others that may search for this. Hoping this isn’t a sign of a new defect out there. I have a MacBook Pro M4 Pro 1TB/24GB about 2 months old. Randomly opened screen, no damage to system and black line across horizontally. Reboots, resets, etc no help. Apple replacing the screen under warranty. Unfortunately it will be 3 weeks as support told me there is a backlog of component replacements required. Whatever that means but they could also tell me anything.
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MBP M4 Pro - horizontal black line on screen - display panel failure
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Got my machine back today, new screen, lid entirely and replaced the ribbon connectors and lid tilt sensor according to the paperwork received. Just noted "defective components" and not much else said. Back to normal.