Seemingly dead Prius turns on when touching negative battery terminal

Yes, I have try it with the key in the slot and then reconnecting the 12V(even switching keys between tries because I don't remember which key I was using when I "killed him" first time) like ChapmanF was mentioning it really looks like it is stuck on the "place" that it was before this disconnecting 12V and HEV fuse. I am now searching for that power button, it might be wasting money but since it shows no lights in the power neither any reaction to touch it can actually be just that or the cable connecting it.

There is a lot of info on failing mfd or display connected to power malfunction but not so much on this particular combination.