lenovo a850 problem help please
 

good tell you, my problem is this I possess a lenovo computer a850 which has the following fault is that when I turn on the display lights up and shows nothing, then go off, but if I insist on further by switching on comes a time where I presented a screen and apagaa, then I still insist and displays the logo of lenovo disappears pretends to enter the system but with the illuminated screen but no picture, and I think the screen is good, because there are times where it shows the logo after several attempts at ignition, I thank you in advance if you can help:confused: