I formatted it fat32, loaded some AVI files on it and as soon as i select it as the av source the screen goes black, sometimes i can bring up the menu and try to change folders but it won't read it at all. This is a brand new 8 gig sdcard i bought from walmart yesterday.

 

The same thing happens when I plug in a USB stick... most of the time it won't even recognize a usb thumb drive (i have several, it won't pick up any of them.

 

Everything else on the headunit works fine... Dvds, FM, GPS etc... Still waiting on my ipod cable to get here.