I have an S2000 that I have not played in a while. Everything worked great last time I played. Now when I fire it up I get no BV start (MEI) and got BV comm failure. I pulled the MPU and checked the battery. 2.9 volts. Reinserted the MPU. Still no BV and now I have open door b and closure m but no BV comm failure. Machine won't do anything. I am using an enhanced board. Honestly, I have not done any tech work on my machines in quite some time so memory fades.... Any ideas? BTW, I did pull a different MEI head and install it in this machine with the same results. Thanks in advance. Ian