Please check the power adapter's connection and test with a working adapter from another unit if needed.
Please clean the RAM socket and re-install the RAM following the Quick Installation Guide.
Kindly disconnect all external USB flash drives and proceed to verify if eMMC is enabled in the BIOS menu.
Please ensure the monitor cable is properly connected or try re-plugging it. If the issue persists, consider testing another monitor or using a different DisplayPort (DP) port.
The USB 2.0 port provides a standard power of 500mA, while USB 3.0 offers 900mA. However, external USB HDDs or DVD-ROMs typically require more than 500mA, exceeding the standard specification. For such USB devices, an additional power source is necessary.
Kindly verify the proper connection of your Ethernet cable or try re-plugging it. If the connection issue persists, consider testing another Ethernet cable.