I have I be doing exactly the same thing...... For a 6 million dollar man pin ....... Brand new 6800,6820 jumped for 2716s freshly burnt and checked numerous times as well as swapped cpu and pia....... Re-verified all traces numerous times ..... Still locked on ..... I'm suspecting Roms as well ..... Any good known source for these Roms ??? The files I got came from ipdb suppose to be converted for 2716s but I'm second guessing that at this point