I have an HP Pavilion Slimline running Windows 7. It came with an SD card reader. I can read SD cards with it, but when I plug in a Micro SD card via an adapter, it is not recognized.
The light turns on by the reader as if it can see that I've inserted the card, but the card does not show up in Windows. Micro SD cards used to work in this reader and work in my laptop readers, so I know the card itself is not an issue. I have also tried with multiple adapters without any luck.