I'm getting so many problems at the moment - and I don't know where to start. The main one is that when I'm on one page (this one, for instance) without me touching any key, or doing anything at all, the screen will suddenly switch on its own to one that I haven't asked for - it's usually what I think of as the "basic" screen, with dates, weather links, and other stuff, which I never normally go to at all. It's driving me mad, and I'm beginning to wonder whether there's something terminally wrong with my computer. I've recently switched back to the keyboard that comes with the iMac, after some time using an older model. I'm not sure whether this is a keyboard issue - I don't really know how to set this keyboard up, and I don't know what to try. Can anyone help?