This sounds like a hardware issue, from what you state. The buggy kb/mouse... The repair shop said they would be fine, but even if everyone you ask says its fine, replace it if it's causing issues for you. With the device state power issue, I would recommend either swapping the motherboard, or swapping your PSU. A T470p motherboard will work with a T460p, but it is advised to buy a dGPU heatsink assembly, as I'm personally not sure if the T470p released without a dGPU. It's a 940MX, though, so it will be fine for light gaming. No AAA titles past... 2013, I'd say, though... Anything not meant for a GT 1030/HD 7770 perfomance level will probably not work well.