I have an Asus A8N-SLI Deluxe motherboard and in common with you I have never had any general indicators on boot up since new. The only time it `contacted` me was when I left the PS/2 keyboard unplugged and a nice lady told me, "No keyboard detected." - that came as a surprise!!!! Now that I have read the manual I am aware this motherboard uses vocal POST messages for pretty much all failures.
Whether this is a feature of other boards or not I`m not sure, perhaps some are now designed only to provide audible notification (beeps/vocal) in the event of failure - which would make sense.