The PI would go to just a red light, and not boot up. That started about a month after my daughter started using it, but I was out of town most of the time for work and couldn't look at it.
This weekend I tried the suggestions on this page: http://community.playpiper.com/t/piper-most-common-fixes/815
- Checked SD mounting.
- Used new SD (imaged)
- Re-imaged old SD
(in all cases, waited 5 minutes for the 4 raspberries or some other indication it was doing something)
Neither worked, just a red dot immediately after connecting to power. Also tried disconnecting all controls from the interface pins.
Hopefully the Pi isn't that easy to short out if this is marketed to children and this is a defective unit. The battery has already been replaced since it was defective and wouldn't charge (thanks for making the replacement process easy).
PS as a design note, it's really difficult to get the SD card out with it mounted to the clear acrylic base (I had to use tweezers).