Mobo M 2 Slot

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Hello everyone,
I just finished building my first gaming pc and it ran perfectly for the first week. Yesterday after work I got home and turned it on and it would not boot into windows and only boot to bios (MSI B450M Pro-VDH motherboard). After checking the bios menu it showed that my new Crucial MX500 M.2 SSD was not connected. I shut it down, removed graphics card (as the M.2 slot is just behind it) and unscrewed it and pulled it out, then replaced everything and powered it back on ( I tried this twice). Nothing still, just booted into bios and showing as nothing connected. This is weird because, just the night before I had been running the machine and playing games and now today (yesterday) would not boot? I fully powered it down the night before as I normally would any computer.
My question is this. How do I know if it's my M.2 SSD that's bad, or if it's the M.2 slot on the motherboard that is bad? Also, How would I go about erasing the data on the M.2 before returning for a refund/exchange if it's bad?
Thanks in advanced, and new member by the way
Slot
Mobo
Mobo m2 slot
Mobo

Motherboard M.2 Slot

Unfortunately, although there are motherboards with M.2 slots that support installing either SATA-bus or PCI Express-bus drives on the same slot, not all motherboards offer that much flexibility. Some have M.2 slots that only support one of those two types.and if it is a PCI Express-bus compatible M.2 slot, it might support only NVME drives.

Mobo M2 Slot

  1. The motherboard M.2 slot #1 shares bandwidth with a SATA 6.0 Gb/s port. When the M.2 slot is populated, one SATA 6Gb/s port is disabled problem.
  2. This motherboard has the following PCI-E slots: 2 x PCIe 3.0/2.0 x16 (x16 or dual x8) 1 x PCIe 2.0 x16 (x4 mode, black) 4 x PCIe 2.0 x1.4 The PCIe 3.0 is populated by 2 R9 290 GPU's (CrossFire) So my only option is the PCIe 2.0 x16 (x4 mode, black) 2 are no issue, would this PCIe slot cripple NVMe speeds?




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