So today I noticed all of my touch buttons on my Dell monitor on, which should only happen when I'm near it.

I figured some dust was on it and activated the buttons or something, so I wiped my hand across the buttons. My monitor turned off and turned back on (as it does when switching input modes) and when it came back on it had a big blue box in the bottom right with an error saying, "No Composite Input Signal."

The rest of the screen was OK, I could still use my PC and switch to my Xbox and it was all good, except for this giant blue box in the bottom right.

So I went to Google searching for help.
I found a lot of people with the same issue, but nobody really had any idea of how to fix it.

I hopped in to the menu and played around for a while until I came across PIP settings. After a few minute I realised PIP stood for Picture-in-Picture (something I didn't even realise this monitor did) and it made sense that this big blue box in the bottom right would be for PIP. I hopped in to the PIP settings and turned it off and voila! The blue box was gone.

So rather than signing up to all these tech help services and posting the answer, I hope my strangely high google rank helps people find this answer :)

Mine is a 2009 model, so my menu/options may differ slightly from earlier/later models, but here are the exact instructions to fix this issue:

  1. Hit your touch button to bring up the touch menu.
  2. Hit the "menu" button and scroll down to PIP settings.
  3. Hit "PIP Mode" (which should read at the moment "PIP") and change it to "Off".