[Virtualacorn-list] Desktop screen goes black

[Brian]

In article <568f73b20bbbailey at argonet.co.uk>, Brian
<bbailey at argonet.co.uk> wrote:
> Very occasionally the VRPC screen goes completely black on my machine
> and reverts to a Win 7 window, which is a bit alarming. Alt-Enter
> returns VRPC to normal.

> Any suggestions as to why this is happening and how to cure the problem,
> please.

> Win 7 Pro and VRPC RISC OS 4.02

Now then, the motherboard CMOS battery was dying, has died. Could that do
the above?