1. Press 'Main' and then 'Power' (Green Power)
2. Using the softkeys, start 'AppleTV'.
3. Using the AppleTV remote (until main remote is reprogrammed), navigate AppleTV interface.
4. Using the main remote, control sound system (e.g. to adjust volume).
5. When done, power off the machines by pressing main and then 'system' (Red Power).
6. Power off the projector by pressing main and then 'system' (Red Power) a second time.