Hi all, Stupidly, I upgraded my TF810C to Windows 10 over a week ago. I lost sound and mic with the upgrade and I couldn't seem to fix it, so I rolled back to Windows 8.1 (UGH!). However, now my tablet just won't work at all. It boots and shows the icons, but touching the screen does nothing, the pen does nothing. I put a usb mouse into it to see if that would work (using the adapter) but all I get is a spinning blue circle. I cannot reach it through the network. It's like it's not done booting or something, but it's been on for three days and I still get the blue spinner when I touch the pen to the tablet. I do not have a keyboard for it. Is there anything I can do to restore to an earlier restore point, or even to reset to factory? Thank you. I'm so bummed, would appreciate any help.