Lenovo IdeaCentre touch screen PC - First Look - YouTube
Lenovo A740 AIO Specs Review! - YouTube
ZAA50/70 LA B031P for Lenovo AIO A740 A540 all in one computer motherboard CPU i7 5557U GT950M / GT940M 2G DDR3 100% test work|Laptop Motherboard| - AliExpress
Original For Lenovo A540 A740 Aio Motherboard With I7-5557u 3.1ghz Cpu 5b20h71228 La-b031p Fully Tested - Laptop Repair Components - AliExpress