Whether I'm using Snow Leopard or Windows 7, my 1st generation Macbook crashes ONLY while connected to the internet via WiFi. It never happens when I'm connected through ethernet. In Snow Leopard I get prompted to restart the computer. In Windows I get a blue screen. Normally I would assume it's the RAM, but it never happens unless I'm on WiFi. The problem started about a week ago. It's an old, beat up, used P.O.S. which I got for a decent price, so I'm not terribly upset. I would still like to know why it's happening, if anyone else ever experienced this, and if there's a fix for it.