Even a millimetre of shift in the location of a USB or HDMI port on a different revision would make it impossible to fit the motherboard back into the original slim chassis. Troubleshooting and Repair
The "Rev.1.0" suffix indicates the first production-ready version of the board layout. This is critical for repair because even minor changes in later revisions (e.g., Rev.2.0) can lead to differences in power rail management, thermal handling, or connector placements. A00984 Rev.1.0
The BIOS/UEFI firmware is often hard-coded to support the specific hardware components found on a particular revision. Using a different revision can lead to "No POST" (Power On Self Test) errors or "Black Screen" issues. Even a millimetre of shift in the location