In some 3rd-party Display Port cables, a pin is connected that causes a power sequence issue. Certain HDD devices, mainly operating systems installed on M.2 NVME devices, can go missing.
Resolve the issue:
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Determine if you have a third-party display port cable.
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If your cable is from a third party vendor, replace it with an HP display port cable.
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If the new cable resolves the issue, replace the cables on the other affected computers with cables purchased from HP or another reliable source.