I was listening to music on my Lenovo Thinkpad T560 when all of sudden my laptop shut off, I try to turn it back on my backlight and power light comes on like normal but my screen stays completely black, when it shut off it was charging at full battery so maybe it over charged but i tried taking my external battery out and holding the power button for 30 seconds but even that does'nt work. I have tried contacting technical support but nothing is working please help me solve this issue.