Memory Card Reader on HP Desktop

[Buckster1]

My HP Pavilion All in One  Desktop will not show some of my memory card photos when i insert into the memory card slot . Some of the cards work and some do not.   ANY SUGGESTIONS

[WAWood]

You have two unrelated issues here -- card formatting and file formatting.

The first is that different cards can use different filesystem formats -- the most common being FAT.  There are others such as FAT32 and NTFS, and a host of non-Windows formats.  You can use File Explorer to look at the card to see how it is formatted.

The second, and more common, is the format the image files uses.  When you right-click an image file, you are presented with a list of apps that could (presumably) open that file.  You will have to experiment with the different apps, as different ones will be able to open different files.

However, if you are not offered the option of opening the files using a specific app, then you will probably have to resort to using an external memory card reader that plugs into your PC using a USB port.