Win10 PCs won't see ATtiny boards I bought some ATtiny boards on ebay but I can't get my computers to see them.  When I plug them in I get the USB connected sound then a couple of seconds later it gives the USB unplugged sound.

The power light stays on and the LED blinks, I assume it has the blink sketch already loaded.

I have added the drivers to the IDE but I reckon the problem is before that, something to do with the Win10 PC even seeing it.  I have two versions of the board, one with a USB socket and one with a USB plug, neither work.  [UPDATE] Should have mentioned that the board doesn't show up as being connected to a port

I've looked around for solutions with no joy, I have tried everything I can think of. 

Does anyone have a suggestion on where to start troubleshooting this?
There were a couple of comments that both led to the solution.

For me the most important was Nick's that the board pretends to have a USB interface for a couple of seconds, and then runs the sketch.  It stopped me tearing my hair out over why the board didn't show up as a port.

Ignacio suggested using Micronucleus.  I did this having installed the Digistump drivers and selecting them.

After compiling I was prompted to plug in the board, voila, it uploaded.

Thanks Stack Exchange!