Hey, I just bought a new Samsung HDTV and I went ahead and purchased an HDMI cable because I was upgrading from a stand def. I attached the HDMI to the TV and I get 1080P output, and I used the left-right audio cables that came with the system to hook up to my receiver. The issue is that I don't get any sound coming out of my stereo, and I changed my audio output setting to Audio Input Connector / SCART / AV MULTI but there is still no sound.

Also, I did change the Audio Multi-Output to ON and I only get sound that comes out of the TV and still nothing out of the stereo.

If anyone can help me in my dire predicament it would be kindly appreciated.

Just go to the audio settings and switch it that way within the XMB.  Not sure how well the multi audio out shit works.. Never fucked with it i just switch it via XMB.

Are you sure you have the cables connected right? They are going in 'Audio In' ports on the receiver, yes?

@SlasherMan: Everything is connected correctly in the receiver. I got perfect audio coming out of my stereo when I had my previous TV with the same receiver hooked up.

Did you have everything connected the same way before (aside from the video obviously)? Were you using the same cables? Did you try perhaps resetting the PS3's settings? Did you try to get audio over the HDMI cable (just to rule out some sort of audio issue with the PS3 itself)?
As far as I can tell, you have it set up correctly as far as the PS3 settings go, so don't really have a lot of ideas here.

Have you confirmed with the new tv that coax input coming from device A (not ps3) -> receiver works? if you have an optical cable you could also consider using HDMI exclusively for video, then digital out to the receiver as opposed to coax connections.