I finally got my system able to update via a proxy, but my first run has totally messed up the video picture.

I had come across this thread:
https://www.petrockblock.com/forums/search/?bbp_search=force+hdmi

which indicated on a new system one should run:

sudo rpi-update
sudo reboot
sudo apt-get update && sudo apt-get upgrade -y

Problem is, after running the first line & rebooting, my system will NO LONGER go into HDMI mode. This is inspire of the fact that it worked fine before running this command, and even after uncommenting both:

hdmi_force_hotplug=1
hdmi_drive=2

I end up with a zoomed in picture that is totally cut off.

In addition there is this little color box in the upper right hand corner that won’t go away no matter what I do (it even shows when my screen is blanked out by the emulationstation screensaver).

Any ideas on what happened and how to fix it? I’m using image v2.3…