In order to setup an automatic repeating PowerPoint presentation you will need to 1) set a timer to auto advance every slide and 2) set it to loop back to the beginning slide from the final slide.

• Go to the Transitions tab
• In the Timing section, located to the far right, you may enter in a time under the Advance Slide heading
• You may repeat this for each slide if you would like for them to have different display lengths or click on the Apply To All button to set all slides to the same display time

• Go to the Slide Show tab
• Click on Set Up Slide Show
• Under the Show options section, enable Loop continuously until 'Esc'
• If you have the slides set to auto advance, under the Advance slides section “Use timings, if present” should be the selected option
• Click OK to save the changes and close this window

Save the file to retain all changes.