Dell Latitude D610 Wifi Won't Work?

I have a Dell Latitude D610 and my problem is that the wifi light won't come on. I've done the Fn+F2 thing and all that is enabled is bluetooth. I've gone to dell's site and updated drivers and done basically everything I've seen others do on forums. What's interesting is that once in awhile, my wifi light comes on and my wifi will work for maybe 30 seconds and then it disappears. When i go to device manager, my broadcom 802.11g adapter sometimes shows up but usually it isn't there. So it's not there with a yellow exclamation mark over it; when it is on there it's fine but it's hardly there ever. I've even removed the wireless card and reconnected it to see if it'd work but no luck.