Problem in Starting of my Dell laptop

Helo

i am facing a problem in my Dell Inspiron 1545 , 2 days ago after power on of laptop MS Logo was appeared and after small time laptop work easily for 10- 15 minute with a little sound click click and than turn off automatically, but today when i started / on my laptop than no MS Logo shown only blank screen / red, green and yellow Vertical and Cross lines came on screen and after half a minute Laptop goes turnoff , i have tried to restart it 2 3 times and all times these again happened, can anyone tel me the real cause of it and how it can be solved?