Acer Aspire 5742ZG screen problem

Hi all

Today i was using my laptop (Acer Aspire 5742G) normally and then suddenly my screen freezes and turns off. The picture at that moment when the screen froze was covered with green horizontal lines and some small green squares and then the screen switched off while the laptop continued to operate normally.

I tried to restart my laptop, but the screen does not turn on, and looks like laptop is wotking normally because I can hear the windows login sound (led indicators for WIFI and read data from the HDD are working).
I tried to connect the laptop and TV via an HDMI cable, but the TV does not get any picture.

Do you have any idea what could be the problem and how it might be solved?