Black/blank screen unwakeable sleep

My MacBook Pro displays nothing but a blank screen. It starts up fine
- at least I can hear the chime and the disk whirring away - but
that's as far as I get.

There's a long thread on the Apple forum about it and it seems to be
sleep related. A solution offered there did sort things out for a day
but then, on firing it up again yesterday, the black screen returns
and no amount of repeating the same procedure which solved it
previously, works.

The previous solution involved accessing the MacBook from another Mac
via target disk mode and deleting the sleepimage file and
extensions.mkext. There was one bit of advice that I didn't do (as it
seemed to be working) which was to "sudo pmset -a hibernatemode 0" via
Terminal. I have also run Verify/Repair Disk and Permissions.

It's a 17in MacBook Pro running the latest v of 10.11

In article
<97272982-ac10-45bc-a77a-40829c4453f1 RemoveThis @d45g2000hsc.googlegroups.com>,
Tiff Sunbacon <jeremy.fieldsend RemoveThis @googlemail.com> wrote:

> My MacBook Pro displays nothing but a blank screen. It starts up fine
> - at least I can hear the chime and the disk whirring away - but
> that's as far as I get.
>
> There's a long thread on the Apple forum about it and it seems to be
> sleep related. A solution offered there did sort things out for a day
> but then, on firing it up again yesterday, the black screen returns
> and no amount of repeating the same procedure which solved it
> previously, works.
>
> The previous solution involved accessing the MacBook from another Mac
> via target disk mode and deleting the sleepimage file and
> extensions.mkext. There was one bit of advice that I didn't do (as it
> seemed to be working) which was to "sudo pmset -a hibernatemode 0" via
> Terminal. I have also run Verify/Repair Disk and Permissions.

What do you mean by "seemed to be working"? What was/is the value of
hibernatemode?

>
> It's a 17in MacBook Pro running the latest v of 10.11

--
Tom Stiller

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