Inspiron 8100..I inadvertently  shut screen down which sent computer into standby mode reducing screen size for some reason.  Its usually a quick fix to hit Fn key and F7 (font) however for some reason my Fn key is not responding.  There is nothing stuck, I have popped open the key and try to depress it that way and no luck.  Someone had suggested deleting the keyboard driver and re-installing to no avail.  Any suggestions on another way to adjust the screen, it driving me crazy I have a 15" screen and am only using half of it.  Please help......