I have a chromebit - using version OS 44 that I installed on a TV using RiseVision. I sized the presentation 1920 x 1080 and a only a 1/4 of my presentation showed. So I checked the info button on the HDMI input and it says the the resolution was 1024 x 768. So I resized the presentation in Rise Vision to 1024 x 768. And it's stretching the presentation like it's 1280x768. I tried doing a 1280x768 but that didn't work either. The chromebit shows that the TV is on overscan. I can't change any of the tv settings. They are grayed out. What can I do to make it not stretch?