|sounds like a possible hardware failure.|
1st, open the small covers on the underside and remove then replace the memory modules, they may have become loose, try one module at a time if you have more than one.
2nd, if its still under warranty return it.
3rd, if its not warranty, and you feel brave, you should attempt to take it apart and reset all connections to make sure thay are not loose, you may even find a video on youtube to show you how to do this on your model, its not really difficult, HOWEVER, save all your files, because its always possible to brick your machine.
4th, take it to a repair shop and be prepared for high costs.
i hate computers!
but cant help myself....