I've been dealing with these two intermittent issues for months now. I've read many forum discussions, but have yet to be able to find a solution. I'm not sure whether the two issues are related or not. Specs: MAC OSX 10.6.6, 2.6 GHz Intel Core 2 Duo, 4 GB 667 MHz DDR2 SDRAM. MacBook Pro 2008 version. 1. "You must restart your computer" This happens often. I thought maybe it was a RAM problem. I've done the hardware test (both short and long) and I've removed both RAM cards individually, but no solution. I've done the clear-the-PRAM thing and still no bones. I just have to keep restarting the computer and eventually it works. 2. "No airport card installed" This one I really don't get. I've purchased a new wireless router to see if that would change anything, but nope. Every now and then I just lose the wireless (and it really doesn't matter what I'm doing online), and then the airport won't turn back on. The thing is, this ONLY happens at home. Never when I'm at school (where I use wireless much more than at home!). I was thinking that maybe there are too many routers around me and that somehow the airport card is getting confused, but I have no idea. At this point I'm really just stuck. I've done lots of Googling and searching these forums, and I'm just not sure what else to try. If it's a hardware problem, the hardware test is doing me absolutely no good.