I have a Mac in the hands get down yesterday by a friend whom it did not get to the run. Now it has her other things, the Apple MAC OS X Tiger install to no avail. The thing boots up and remains a gray screen with the folder looking +? stand. Unfortunately I have not Apple keyboard, but there have got a simple Windows keyboard there. What can I do? Does anyone have tips what can I do? If I boot with Alt key, I do have a mouse but only a gray screen and nothing more happens. Is this the problem of start-up or something else? Any help is appreciated. Thanks in advance.