Yes, there are ways to permanently disable a computer's internet access without damaging the hardware. Here are a few common methods: 1. **Disable the network adapter**: Disable the network adapter in the operating system's device manager. This will prevent the computer from accessing the network through that adapter. Although the user can re-enable it, it is an effective blocking method. 2. **Modify network settings**: Block network connections by changing the network settings in the operating system, such as deleting all network profiles, proxy settings, or simply not configuring TCP/IP protocols. 3. **MAC address filtering on the router**: Set up MAC address filtering on the router to deny the target computer's MAC address from connecting to the network. This requires administrative privileges on the router. 4. **Use firewall rules**: Rules can be applied through a local or external firewall to completely block the computer from accessing the external network. 5. **Uninstall the network driver**: Completely uninstalling the network adapter's driver will cause the device to be unable to connect to the network. If this function is required, the driver must be reinstalled. 6. **BIOS settings**: Some computers allow the network adapter to be disabled in the BIOS or UEFI. This can basically prohibit network access. Note that these methods will block most users from accessing the Internet, but technically savvy users may be able to circumvent these restrictions. True permanent disabling may also require physical encapsulation, removal, or modification of hardware components.