My board doesn't boot up when I press the reset button? what should I do?

First make sure the board has power and your serial line is working fine on the computer. If everything is fine, try to restore the Dbug12 program. You need to put the board in Bootloader mode (using the two switches in the bottom right of the Dragon12 board) then reset the board. If you see the options, you need to erase the flash and eeprom and then restore program the board by using the provided Dbug12 in download section of this website. If this doesn't help, you need to try Master/Slave configuration and test your CPU or flash again.