fungus:
Dblade4:
Could it be that I need a crystal (16MHz)? I thought it was unnecessary with that configuration?It's nothing to do with configuration.
If the chip has previously been set to use a crystal then you need a crystal to be able to unset it again.
How can I check this? I bought this ATmega http://www.ebay.com.au/itm/160768276199?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649#ht_2823wt_1139