My computer will only start in safe mode. When I try to start it normal it flashes a jumbled grey screen for a second and then a blue screen with writing for a second (flashes so fast I don't have time to read what it says). Then takes me to the screen that says 'Windows was not shut down properly...' and gives me start-up options including Safe Mode, safe mode with networking or normal. If I try to start it normal it just does the same thing all over again. It starts and works fine it in safe mode and safe mode with networking, I can do everything I normally do in safe mode except there is no sound. Can anyone help?