Preparing automatic repair

My laptop Inspiron N5050 laptop is stuck in the preparing automatic repair loop.I checked online and tried to press Cntrl+F11 as it wasoffered as a solution by someone  but it just automatically  goes off while at it.I have run the diagnostic test but it says everything  is  fine.what can I do? I have seen a lot of posts regarding the same  problem but non of the solutions offered  seem to  work  for me.please help