Oldy, 13inch,White MacBook. System 10.6.8/2gib memory/2.16 GHz Intel Core Duo Startup fine, always with chimes. But recently, when lifting the screen from sleep mode, screen refuses to come up completely. Can see faint outline of desktop but requires restart to get screen back to normal. It was suggested to me that the problem maybe a 'hinge switch' that's wearing. This appears confirmed as once pen and by moving screen slightly back and forth I can sometimes bring up the desktop. Any useful opinions before I take it in to be looked at professionally? Thanks in advance.