My internal wireless card....

Hi,
I was wondering if anyone could help me.. My laptop is pretty new. Only about 4 weeks old or so.. and it had an internal wireless card right inside of it. But now.. it seems has completely stopped working.. I can't find it in my network connections anymore and I've tried many times I'm wondering if anyone has any idea what happened or any way I can get it to work again.

It's a dell E1505
If you want anymore specs that might help then please ask

Make sure it's seated properly. Also, is it supported on some Lunix distribution? Try a LiveCD to determine if it's a hardware issue or if it's related to your Windows install. Also, maybe try the Dell diagnostics disc thing it came with?