The Lenovo ThinkCentre Edge 71, type 1578, has two single-lane PCI Express slots and one sixteen-lane PCI Express slot. Devices inserted into the ×1 slots (for example, NVMe adapters) work fine. However, devices (even the same devices) inserted into the ×16 slot power on but are not seen by the operating system. What's the problem, here?
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Hit F1 during boot to get to the BIOS settings, then choose Devices → Video Setup, and set Multi-Monitor Support to Enabled.
Presumably whoever designed this interface couldn't imagine the PCIe×16 slot being used for anything other than a graphics card.
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