My model turned black! (help needed)

i was working with my headmodel when i suddenly pushed the wrong button, and the model turned black!!!
how do i reverse this?

Here’s a pic of it,

Well Ctrl Z is undo but I’d be amazed if you didn’t know that.

Could be a lot of things though, did you erase any lights? Did you turn “Shadeless” (makes the material flat so if the color of it was black it’ll be black all over) on in the Materials window (F5), did you simply just change the color of it? Or did you maybe press alt Z and turned the 3D view into textured mode?

Hope one of these suggestions will help.

Thanks, that did it!