according to the manual the unit should power on when you start the sound manager software with a pc connected. not sure though cause that contradicts the first statement shown below
You cannot turn power on/off from the PC. Turn power on/off on the
Commander. Refer to Commander Section “Turning Power On and Off”
(page 35).
When an Ai-NET compatible head unit is connected, the power of the
unit is linked with the power of the head unit.
• When the power for PXA-H800 is turned off, Sound Manager for
PXA-H800 will be closed.
• If an Ai-NET compatible head unit is not connected, the PXA-H800 is
automatically turned on when Sound Manager for PXA-H800 is
started.
You cannot turn power on/off from the PC. Turn power on/off on the
Commander. Refer to Commander Section “Turning Power On and Off”
(page 35).
When an Ai-NET compatible head unit is connected, the power of the
unit is linked with the power of the head unit.
• When the power for PXA-H800 is turned off, Sound Manager for
PXA-H800 will be closed.
• If an Ai-NET compatible head unit is not connected, the PXA-H800 is
automatically turned on when Sound Manager for PXA-H800 is
started.