I have a circuit board with a Mega128, voltage regulator etc. I used the old version of the board for 2 years without problems. Since two days, I have a new one which worked fine, too (same electronics).
I flashed the mega128 about 8 or 9 times since yesterday. Then, from one moment to the other, AVR Studio says: Entering Programming Mode: FAILED!
and the program which is already on the chip doesn't work too, but worked fine before.
Question: Is it possible that the mega128 is damaged? I used the internal clock with 8MHZ and think that I did not set any lock bits. I'm a little bit surprised because this never happend during the past years with the old board.
5V supply is still ok, reset pins etc. are exaclty as they were before. I use an STK500 to programm the chip.