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RE: optiplex 9020 aio windows 7 after install bsod issue

Did you load SATA drivers during the Windows install? If not try to load them, see here:

This driver in particular:

P.S. I don't think you will be able to use online diagnostics because you don't have Windows correctly installed and hence can't go online. You may however use the F12 preboot diagnostics:

Dr Philip Yip
Tech Enthusiast and Author of the Unofficial Dell Windows Reinstallation Guide

Windows FAQs and OEM Downloads

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