While there is no Auto Power On/Off feature for Symphony Desktop, the power on/off is done through the knob.
To power on Symphony Desktop, tap the Control Knob to power up Symphony Desktop
The touchscreen flashes for approximately 30 seconds as the internal processor starts.
Here's a video showing how to power on Symphony Desktop:
To power off Symphony Desktop, tap and hold the Control knob, then tap Shutdown to power off Symphony Desktop.
To put Symphony Desktop in Display Sleep mode, tap and hold the Control knob, then tap Display Sleep to turn off the touch screen but maintain full audio and Control knob operation.
Lastly, you can enable Sleep Timer on Symphony Desktop.
The Sleep Timer puts Symphony Desktop's display to "sleep" if the Touch Screen is untouched during the set time.
To engage Sleep Timer, hit "Settings" icon until Settings Page 3. Then click "Sleep Timer" and choose time.