Latitude 5580 Downgrade To Windows 7

I am deploying 4 dell e7470 s and downgrading them to windows 7 to match the company standard. I am not able to run the laptop with one module. Everything works well till i remove one module.

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15 6 Zbookg3 I56300hq 8g 256g Laptop Hp Mobile Studio

15 6 Zbookg3 I56300hq 8g 256g Laptop Hp Mobile Studio

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