STK1000/Troubleshooting
From AVRFreaks Wiki
The RED power LED is not on
- The DC cable is not connected
- Wrong power supply polarity is used
The LEDs display a random pattern when a cable is connected from the GPIO header to the LED header.
- When the CPU does not drive the output pins the input of the inverters driving the LEDs will not have a defined input potential. This is seen as a random pattern on the LEDs. Check the code running on the CPU.
When a cable is inserted from the GPIO header to the LED header the CPU is reset and the starter kit make a high pitch sound.
- The 3.3V pin on one of the headers have been shorted to GND.