This explains what someone was
seeing earlier: that after recording a macro, the remote would ONLY send [Power On].
When recording a macro that makes use of a preprogrammed Sony device, if you need to use the [Power] button:
A short press will send the [Power On] command. You'll note that after pressing [Power] the remote will beep and the little "On" will flash inside the [Power] key.
A long press will send the [Power Off] command. Keep holding [Power] until the remote beeps. The little "Off" will flash.
*And* the remote is smart enough to send a normal learned command if something has been taught over the [Power] key (the RM-AV2100 did not do this, causing various issues).
Back to the original poster: is that a combo unit? If so, then it's possible it doesn't have discrete power commands at all.
As a workaround, does sending an input command turn the receiver on? It does on most Sony receivers...