Why won't the Lenovo display turn on?

Question

laptops

Good afternoon, ladies and gentlemen. Armed with a laptop Lenova IdeaPad Z565. When turned on, all indicators light up, cooling starts and even the hard drive, but the display itself is black and no movements occur. Initially, the problem was in the power supplies, the plug was a couple of millimeters smaller and I had to constantly correct and restart the laptop a couple of times in order for the display to work, but at some point it simply refused. Already changed the RAM, HDD and checked ALL the cables on the board, not where, nothing is pinched or damaged. Batteries from the laptop are gone for a long time, it works directly from the outlet.
P / S Connect monitors via VGA and HDMI, still no image