wireless adapter not detected

I've got an Inspiron 600m and have been having a sporadic problem with my Intel PRO/Wireless 2200BG internal adapter - ocassionally after startup, the system does not recognize the presenceof the adapter (when I open my Intel software, I see a grey wireless symbol with a red X and "no supported adapters in the system" ).  This has been happening periodically since June, and usually I can solve the problem by shutting down the computer and restarting once or twice (or a few times).  Today that seems to no longer work - I've probably restarted about 20 times so far, sometimes right away, sometimes after several minutes of being shut down.  I've tried reseating the PCI card and removing and reinstalling all the software.  Any other ideas?  I've had trouble with the ethernet adapter as well, so right now I'm updating by burning updates onto cd's.  Unfortunatly, my warranty expired in March.