I have an SN10 (non B model). A week ago I upgrade it to the latest
software, everything functioned fine after the upgrade.
Today (probably unrelated to the upgrade), when I power it up it goes to
a blank screen and stays there, no audio sound, and the 2 varios peg to
the down position. I reseated all the connectors, but no change.

Any ideas or does it need to go to the shop?

Thanks,
Wells