Client machines are experiencing random startup failures. Every time this issue occurs, unplugging the network cable and then rebooting restores normal operation. The startup process gets stuck at the MAC address screen without progressing further. Power cycling or disconnecting and reconnecting the network cable resolves the issue, as shown in the following image: Suspected a cable issue and replaced it with a new one, but the problem persisted even with a new cable and properly connected crystal head. Attempted switching startup modes, testing both compatibility mode with and without checkmarks, but no improvement. Adjusted BIOS settings, disabled features like Secure Boot and Trusted Computing, yet the issue remained unresolved. Considered the possibility of a network card initialization problem. Updated the BIOS version through the official website, and after observing for a few days, the issue no longer reoccurred.