It's certainly possible, but probably more work than you would think. I do this two completely different ways, depending on what exactly I am trying to do. My graphics card has a TV-out socket and can take the sound output as well. I use this style when showing digital photos, usually very soon after I have uploaded them. It is possible to configure the software I use to take different lengths of time on each photo and use various transitions, but I wouldn't bother when I am running things this way.

The other method I use is to prepare a DVD on the PC (I use VideoStudio), write it from the PC and then play that on the TV using the DVD. Again, I mainly use this for photos, but for a more planned 'presentation', varying timings, mixing stills with video files, adding in captions etc.

Notice that both methods use things you may not have!