Check in the BIOS make sure it's not disabled, check to make sure the hardware on/off switch is set to on (maybe not a switch but a function key toggle), did you check in Device Manager to see if the wifi card is seen there with no errors?
Check in the BIOS make sure it's not disabled, check to make sure the hardware on/off switch is set to on (maybe not a switch but a function key toggle), did you check in Device Manager to see if the wifi card is seen there with no errors?