E-reader. Very nice. The other day I fell on it and broke it in some mysterious way. After the fall the backlight turned on with a long-press of the appropriate button, but the display would not change from the standard picture. After a while that stopped working too. Nothing worked.
Took it apart and couldn't see anything obviously broken. A new one is ~$25 on ebay, so buying a $9 battery on spec is silly, especially when I have a spare from a yard sale.
Can anybody speculate on what might be broken?