Laptop crashed, fans are fullblast all the time...

I have a white MacBook and its three years old. It all of a sudden crashed last night and when I switched it back on the fans were running full, the time set to 1-1-2001 12:00am and there is an X through the battery sign. When I click on the battery charge symbol it says " No Batteries Available" although it clearly does as it runs without needing a charger. And then there’s the fan. It started running at full speed (like I was playing a game or something) and it just runs like that all the time. I have restarted my computer and shut it down several times and the only problem fixed is the time. Also when the screen is shut it doesn’t go to sleep or even show signs that the lid is shut? I haven’t done anything to dislodge the sensor so I don’t know what the problem is.

Any help to fix any of these problems would be awesome. 😐