Hi, i'm new here ,too. My A500 has done the same thing. Hung on the Acer screen. It hasn't been 'rooted' or custom recovery or upgraded to ics. i might have about a week left on warranty so I need to know if this is fix youself thing or should I send it away.
I've tried hardware reset. and power and volume buttons. no change. once it actually went as far as the "android" screen and hung there.
I've tried syncing with my PC but the download failed.
I'm not really computer savvy. Please help