My SL300 is not showing Ethernet card after system restarted. However, there is no problem when doing a cold boot or starting machine with Power button.
Download latest Ethernet card from Lenovo Support page.
Note: Machines with windows preloaded may encounter this issue. The Ethernet device driver in the latest Windows preload has a reboot
time handling issue of the Ethernet device in these ThinkPads.
For more info, you may refer to Hints and Tips from Lenovo Support Site - Ethernet device is not available after restarting or rebooting - ThinkPad SL300, SL400, SL400c, SL50...
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