Hi, I'm new to the forums, and if I am honest, I have only signed up because I am seriously starting to panic about the health of my Mac Book. Recently Mac OS X has been quitting unexpectedly, and I have no idea why. It just seems to happen randomly while I am surfing the internet, and it has only started happening since I bought my USB mobile internet dongle. What could be causing the problem? Do you think it is anything serious? My Macbook is a white, early 2008 version, it is a 2.1 Intel Core 2 Duo with 1 gig of ram, any help and advice would be much appreciated.