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Frequently getting black screen after Apple logo

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Sep 8, 2014
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Motherboard
Mavericks 10.9.1
CPU
i5 2500K 3.31Ghz
Graphics
GeForce 8400GS 512mb
Mac
  1. 0
Classic Mac
  1. 0
Mobile Phone
  1. 0
I recently installed Mavericks 10.9.1 using Unibeast and then Multibeast.
Everything works great except that during the installation, so when I boot from the memory stick and even now post installation, I get a black screen after the Apple logo. The monitor loses signal and goes on stand by mode.

I went through a few threads of people getting black screen after the Apple logo but they all seem to say that they get that every time. I get that sometimes, I would say about 60% of the times.
So if I turn my computer off and on again a couple of times everything works fine.

I tried entering different bootflags that people suggested from other threads. For example I tried GraphicsEnabler=Yes, and it worked. But when I tried the next time it didn't.

I suspect this is a problem with Graphics Card as it is quite old but why does it happen only sometimes?

Can anyone help? My spec are in my profile.
 
error mavericks.jpg


Here is an error I've notice when I boot using the "-v" bootflag.

Any ideas on what it means?
 
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