Laptop wont start

Hello, my laptop stoped working a few weeks back , its a fujitsu siemens amilo li1705. When I press the start button then the went starts working and a few lights start burning, the wifi light and the power light, but the skreen stays black. Its not the power suplys fault , and not the batteries , also tried to take the battery and cord off the laptop and holding the start button down for 10 seconds and then reataching the battery and chord but no luck. I hope somebody can help.

P.S. : Sorry about my english.