NeXT Cube - powers on briefly then off again

[Toby Thain]

On 2015-10-25 5:28 PM, Toby Thain wrote:
> Hi,
>
> After a few years I wanted to try my Cube with the soundbox/VGA splitter
> configuration for the first time. (I have the fading phosphor N4000A so
> have been keen to have an alternate video solution.)
>
> However, all is not well. Using the keyboard power button, the machine
> powers on for a couple of seconds, just long enough to see a NeXT logo
> and grey desktop on the VGA (yay!) but then powers itself off again.
>


I did the obvious thing and tested it with a standard monitor and cable 
and everything is okay. So the problem must exist with the 
splitter/soundbox setup. Soft power signals?

Any suggestions welcome.

--Toby

> Any clues?
>
> Thanks in advance
>
> --Toby
> (not having a good classic computing week)
>