So I have a HP Pavilion dm4 i5 1st Generation.

Recently, my laptop backlight turns off. I noticed that if I put it near sunlight, I can see VERY little of the screen. I used to be able to tilt the screen and the backlight will turn back on but sometimes it doesn't turn on. Also, the escape button and windows button doesn't work now...

Do you think it might be dust problem? Invertor? Backlight? I had this computer for about 3 years. I can't play Gunz because I can't even press escape to log out of a room without starting the program ALL over.

Help Please?