If the light on the internet switch on the front of a laptop does not change from yellow to blue, what does it?

What does it mean? How can I fix it? the light on the front of the laptop does not change colors and we can not connect to the internet.If the light on the internet switch on the front of a laptop does not change from yellow to blue, what does it?If it's a HP laptop, it could be the wireless card is dead.

It's a known problem.

http://h10025.www1.hp.com/ewfrf/wc/docum