[heero_yuy]

I assume that you have programmed the VM remote to operate your TV?

If so it looks like the powerup button activates the TV but not the VM box hence the "no signal" from the HDMI.

Pressing some of the other buttons probably wakes up the VM box (Sometimes).
That could be due to the fact that the recent VM boxes have two levels of shutdown, one is still ready to power up instantly whilst the deeper sleep does a full boot.

You could try unassigning the VM remote and then activate the TV with its own remote and then seeing if the VM remote stops and starts the VM box reliably.

HTH