AVR-Chat

Hi Guys,

I have a board with atmega128L and have sucessfully programmed the chip using an AVRISP. However after adding some components on board, I get "AVRISP Error entering programming mode" in codevision and a similar message in AVRstudio.

- I know that the AVRISP is working as I have been able to program another circuit board w/ a mega64.
- I tried using STK500 programmer with the mega128 board, but I get the same error.
- the programming pins are directly connected to the AVRISP port via 600ohm ferrite beads.
- I tried to insert a 12k pull up resistor on the reset pin, but same reults
- The components I have added before the board wont program are several zener diodes across some GPIO's and 2 vibration sensors.
- The last code I have programmed on the chip seemed to work. so i could not be certain if it is the chip that is damaged.
- changing the chip would be the last option as i have already changed
before and the PCB is starting to be damged. I would really appreaciate 
if u guys could enlighten me on how to proceed.

thanks!

Chris