[Adam]

Hiya. When you're trying to connect to the computer, are you making sure to switch the Tangara on first? It won't show up if the device is off.

For the SD card troubles, try inserting the card then performing a hard-reset by holding both volume buttons and switching the lock switch off and on again. This will force it to reboot, which often solves card detection problems. If the problem persists, you may need to check that the problem isn't the SD card itself. Try formatting it first and if that doesn't work try using another card formatted FAT or exFAT. 

Doing a hard reset may also help with getting the device to show up on the computer.

Please let me know if this helps or if you need more assistance :3

Thanks for the suggestions.

The Tangara is definitely on when I connect it.

I tried doing a hard reset, but it doesn't seem to work. With the power switch on, I hold down both the volume buttons simultaneously, then toggle the power button off and back on. The screen comes back on showing whatever was there when I toggle the power off, and nothing appears to have changed. I'm not sure if I am doing something wrong or if there is something wrong with the buttons, but I haven't been able to get it to reboot.

The card is formatted exFAT and still not showing up. I loaded some music files onto it, which show up when I insert it into another device. I don't have another SD card handy, but I will try that next.