The screen was stuck in a stretched 800x600 resolution, the Wi-Fi toggle was unresponsive, and the once-mighty Nvidia GT 540M was nowhere to be found in the Device Manager. The "proper story" of an Asus K43S revival always begins at the portal. The Search for the Lost Drivers
If you abandon Windows, the K43S runs perfectly on Linux due to open-source drivers. The nouveau driver handles the GT 520M, and the iwlwifi module supports older Intel Wi-Fi cards. However, the Atheros AR9285 requires the ath9k driver. asus k43s drivers