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Hello! I have reviewed the user guide for Dell OptiPlex 790 and 990 computers. This document primarily deals with important changes to the system board, especially regarding the absence of a heat sink and a power thermal sensor in current models, and the necessity to use BIOS version A11 or later to avoid errors. I'm ready to answer your questions about the information in the document.
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What components are not included in the system board of Dell OptiPlex 790/990 computers?
What should I do when replacing the system board in a desktop chassis?
What warning message will be displayed if BIOS is downgraded to a version earlier than A11?
What error message might I see during POST if the BIOS is not updated?