Installed Yosemite, works great but sometimes boots to black screen

[acc41d]

Hi,

I did a clean install of Yosemite 10.1.1 using Unibeast and Multibeast.

Specs:

MB: Gigabyte GA-Z68MX-UD2H-B3
CPU: Intel Core™ i7-2600K
GPU: AMD Radeon XFX 1GB D5 X HD6870 BLACK EDITION R
MEM: Corsair 16 GB DDR3-1600 Quad-Kit
POW: OCZ ModXStream Pro 600W ATX2

Problem:
80% of the time it boots and everything works perfectly fine. But 20% of the time it boots but the screen just stays black. The system boots and is fully working (tested with TeamViewer) but screen just doesn't show anything and goes into power saving mode because there is "no signal". I simply power off and unplug the power cord, wait for a while and retry again. After a few tries it works.

Any ideas what might cause this?

Thanks.

 

[brosmonaut]

Did you ever solve this? Got same thing.