Ok, got a 42in plasma from Costco 42PF7320A/37 two nights ago.

In Virtual Surround Sound the right speaker (when facing tv) has a vibe when some deep bass hits (not much but its there).  Not noticed when set to Stereo

When TV is on - perfect
When TV is off - high pitched noise (like something only a dog would hear) as if the capacitors (whatever) were constantly charging.  Unplug the set from the wall and noise goes away (discharges)

Costco should let you return it since it's only been a couple days.

return

Before you take it back, can you plug it into an electrical line conditioning power strip (the $50 kind from Monster Cable)?

I had something similar happen with me until I got the power conditioner. For some reason the electrical in my house caused it. It's fine now.

Quoted: Quoted: Costco should let you return it since it's only been a couple days. My first instinct, to recommend that to her. I guess my real question is.  Will she get another TV with the same issue (minus the speaker buzz)?

If so, return that one as well and either get her a different model.  From another store, if necessary.

I highly recommend both Panasonic and Pioneer plasmas.  I have a Panny 37" and it's great.

Quoted: I guess my real question is.  Will she get another TV with the same issue (minus the speaker buzz)?

Very hard to tell.

While the speaker buzz is probably just a mechanical issue with only that set, the high pitched noise might be something that all the sets could experience.

When the set is running it applies a certain "load" to the power supply.  When the set is turned off the load is reduced but it is quite possible that the power supply is still running to keep certain electronic circuits functioning in standby mode.  When in standby mode some switching power supplies will throttle back to burst or discontinuous mode for higher effeciency - sometimes this causes ringing or high pitched oscillation, usually not harmful but definitley annoying...  
This could be common with that particular set - or  not..

Will exchange.

Line conditioner is a good idea as well in general (hi-end electronics after all )

thanks for the replies