I suspect that the soldering on the crystal was not perfect for the first time(?).
one more thing I forgot to mention earlier. with my replacement crystal I tried loading a new example from the MeggyJr set. and after this attempt the board started to operate…I mean that with the replacement crystal when I switched on the board nothing has happened. only after I loaded one of the example.
but as I wrote I don’t have too much experience so I am not sure either was it soldering problem or some temporary issue with the ATmega?.