Dear sir ....actually i clear u ....there wasnt any clear me ....actually i have replaced the motherboard of that laptop first it was with i5 processor later changed to i7 ...then touchscreen didnt work...and i copied bios from dead laptop it didnt work then i copied one of bios here in vinafix system worked ..but problem was still same few days ago i got same issue in 840 g3 i changed motherboard but touchscreen not worked but i was having a copy of 840 g3 bios i did that and system worked fine with touch screen as well...