I have the 20inch intel imac running leopard. Out of nowhere it started going very slow, spinning wheel every other click. Then just freezes. And now I can't start the computer again. It stops at the grey screen with the apple symbol like its loading but never does. I've tried unplugging the whole thing then again got a blinking question mark folder. I just keep getting different things. A blank white screen. Any simple solutions or easy steps to follow? I don't know much about the computers but if anyone has any advice I would appreciate it.