Starting problem laptop automatically closes

Hello,

Sir/Madam, First of all I am a person with less knowledge about software/hardware problems. I am facing problem with starting my laptop, each time I use to switch on the button the first appearance that a laptop shows i.e. the company name (mine is Dell Inspiron), so after that it automatically gets close and repeat the same without any action. I use windows 7 as my OS. It will be gradful if you guys help me to solve my problems. Thank you