First, I don't think that will hurt the receiver.
I have another option for you, though. Do you have an SD memory card? If so, you can load the images on there (can download them from the same page as the DVD files, and they are 8KB in size) and play them as a slideshow on the TV (just have them be the only images on the memory card). That's what I did. That way, you don't need to power up anything but the TV.