I have windows 8.1 Installed on Lenovo T410 , It was working fine, suddenly the message came on bootup that configuration is changed..system went off. When i tried to boot there was no diaplay on my internal monitor, when i check on external desktop monitor , i have display and sysytem iw working is fine.. I tried to check the screen it is black, but if you put some torch light from backside of the screen , u can see the Display..I tried ro check the inventor on my friends sysytemn and it was working..Please can someone suggest me how can i solve this display issue