Sorry about not having shipped instructions. I wanted to get everything shipped before Chinese New Year shuts everything down until late February. The manual is one of the things I decided could be put off until later. I should have included a quick instructions guide though.
The device may have entered bootloader mode. This can happen the first time the device is powered up or the battery is replaced. Also, the unit may not boot if the battery is too low. The T400 can also be put into bootloader mode by holding down the the graph and backlight buttons while power cycling the T400. Bootloader mode will last for about eight seconds.