I have strange problem with my almost new laptop. After I leave it turned on for some hours and return to use it, it was printing something like ^[[2~ on the screen and I cannot stop it. After rebooting it did not show any activity. After a few hours I managed to turn it on by hitting random keys on the keyboard. It starts that way but I have to use an external keyboard to type anything. When I randomly stroke the keys when it is turned on, it sometimes prints unrecognised characters. It works the same way in Linux and Windows (Ubuntu, Windows 7).
What can be the reason it started to work so strangely and is there any way to fix it without sending it to warranty and waiting few weeks? I don't remember getting it wet, but there could be something like cigarette ashes in it.