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When a computer’s onboard LAN adapter fails, one effective solution is to add a network card using a PCI slot. This option allows you to bypass the malfunctioning onboard adapter by providing an alternative means for network connectivity. Installing a dedicated network card can often be a straightforward process and is typically a reliable way to restore networking capability without needing to replace the entire motherboard.

This solution is particularly useful if the motherboard is otherwise functioning well and there aren’t any other issues that necessitate a complete replacement. As PCI slots are standard components in most motherboards, adding a network card can also enhance network performance or provide additional features such as faster speeds or advanced networking capabilities, depending on the card selected.

The other options, such as checking cable connections or reinstalling the operating system, would generally be preliminary troubleshooting steps but are unlikely to resolve a failure with the onboard LAN adapter specifically. Replacing the motherboard would be an excessive step if it is solely the LAN adapter that has failed, as it often involves a more extensive repair process that includes addressing other components and requires more time and resources.