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Elitebook 8470p black screen after using external monitors

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Joined
Sep 14, 2011
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4
Motherboard
Dell Precision M6700 (Clover)
CPU
i7-3740QM
Graphics
HD 4000 & K3000M
Hi,

I'm having problems with my Elitebook 8470p (HD4000) that has mavericks installed with clover and the Probook 6.1.14 clover edition installer. When I installed everything, I used the internal screen, but have used an Apple Cinema Display connected with a DVI-D to Displayport adapter as an external display on a Advanced Docking Station on the first displayport. I've also been using a VGA monitor on a displayport adapter on the laptop's internal displayport, as it does not work on the docking stations second displayport, to have dual external monitors with the laptop closed.

I have two problems, when I remove the external monitors and try and reboot to use the internal screen, it get's to the apple logo after clover and fades to black (using the -v flag, it fades just after the text turns from the system font to a graphics based one. I can then only get to a desktop using the -x safe mode flag. If I reattach the external monitors it's fine.

The second, if I wake the laptop from sleep, I have no sound. A reboot does not restore it. I have to install the support kexts for the 8470p from the probook installer to get the sound back. I'm using and SSD, if that makes any difference. I also have no sound through the docking station, but I'm looking into another thread to try and solve that!

Any ideas?

- Colin
 
... when I remove the external monitors and try and reboot to use the internal screen, it get's to the apple logo after clover and fades to black (using the -v flag, it fades just after the text turns from the system font to a graphics based one. I can then only get to a desktop using the -x safe mode flag. If I reattach the external monitors it's fine.

What happens if you use your brightness up key?
 
What happens if you use your brightness up key?

Nothing screen is still black, but given the disk and wifi activity the OS is loading, it hasn't hung.
 
Please accept my noob apologies, it was all about the brightness. I was pressing Fn+Brightness-up rather than just the Brightness-up key. Yeah, I know ;) Thanks for your help.
 
Please accept my noob apologies, it was all about the brightness. I was pressing Fn+Brightness-up rather than just the Brightness-up key. Yeah, I know ;) Thanks for your help.

It is switchable in SysPrefs->Keyboard->"Use all F1, F2..."
 
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