I have seen some very strange behavior with my MKIIa when connected to the sled connector with the tuner attached but power supplied from the home power jack.

The player won't reboot from emplode after a sync it just switches to the flashing LED, not standby as you can't wake it up.

Also the serial on the player won't give me a shell if I have the tuner connected.

Ethernet however seems to continue to work.

2.0 b7 developer image