I tried another usb key and that one worked.
However, I notice that some photos display well, and others don't display at all. I'm new to viewing photos on an lcd tv, so I need to figure out what's going on.
For example, one photo that displays well is 1800x1200 pixels, and has a document size of 5x4 inches (according to Adobe Photoshop). Yet, another image that doesn't display at all is 2200x2293 pixels with a document size of 7x7 inches. The photo that does not display has a size reading of 0x0 on the lcd tv monitor. I tried reducing the size of the image that doesn't display to 1800x1796 to more closely resemble the photo that displays well, and the result is that the newly sized photo doesn't even get acknowledged on the usb key at all when viewed on the lcd tv. All photos are in .jpg format.
I can't draw any conclusions from comparing these two examples.
Both have a similar pixel and document size.
Maybe usb media is less stable than if I viewed the photos with a dvd-r disc.
I may be grasping at staws here, but I don't know what else to think.