Here's what I've got.
My PS3 is hooked up to my 1080p LCD PC monitor (a Dell S2409W) via HDMI. In turn, the monitor is hooked up to my PC speakers via the line out port.
The problem I'm having is that it takes time for it to recognize that there's a sound signal - rather, it defaults to mute, slowly rises in volume, and then cuts off again when there's no sound. So there's no lovely bootup blurb, and the click-click-click of scrolling menu options is muted entirely if I scroll slowly. For another example, the company logos when I played a DVD (yeah, I don't have much of a Blu-Ray library yet) have no sound; the movie plays fine, unless I pause, in which case the sound turns off again and the movie is muted for a few seconds when I press play again.
Does anyone know just what the hell is going on here? Do I have a bad HDMI cable? Is my monitor being persnickety about its sound I/O? Is there some obscure setting on my PS3 that I haven't turned on or off yet?