When wireless switch is flipped

Question

When wireless switch is flipped on Toshiba laptop Satellite A105-S2716 - the screen goes black and blinks repeatedly. I thought my screen was going bad but as soon as I flip the wireless switch to 'off' and hook into my ether-net connector (land line versus wireless) the screen is fine. I called Toshiba and they said they have no idea and want me to bring in for service. Would like to avoid that as I need my laptop everyday. Anyone know what the problem could be with my wireless?