So I had my Optiplex 790 reworked a few years ago; in the spring of 2020 I tried logging in and suddenly there was no internet. There were no other issues beforehand. I let it sit unused for a while because I had an all-in-one where the wifi still worked. That ran into an issue last fall, and I decided to try the Dell again, only to find out it wouldn't turn on. I've tried several different power cords to no avail. Will it need a new power supply? I'd like to know before spending any money or effort on it. Also, what is the best way to solve the lack of a wifi connection? Thanks!