Hi! I did make sure about the PSU switch. Yeah, there's 1/2 lights on the motherboard, one of which I'm pretty sure is the power LED. I can't see my specs through my PC, and I don't remember much.
I do know these:
Motherboard: ASUS H170M-PLUS
CPU: Not sure, but it's an i3
GPU: GeForce GTX 1050Ti...