I recently purchased an a500 and I noticed for the first time today that it has a faint high pitched whine coming from the back of the unit, most noticeably from the speaker cutouts. It gets louder when plugged into the charger, but is still extremely faint. The noise is not present when using headphones, and adjusting the brightness or turning off the auto brightness makes no difference. I searched (yes, i searched first, lol) and found some info about screen whine, but nothing specific to the a500. I originally thought maybe the speakers were picking up something, maybe from a bad ground, but the noise is extremely consistent. it never changes pitch and only gets slightly louder when plugged in. My first instict was to exchange it, but I have already done that three times to get one with no dead pixels. The noise is extremely faint, and were it not for my OCD, I probably never would have noticed until I would have tried to watch a movie in a quiet oom while charging. Any thoughts would be appreciated.