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Yosemite - Black screen at boot after new install
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Question

My HP laptop's specs:

HP Pavilion DM4-1253cl

Core i5-460M

6 GB DDR3

Intel HD Graphics

500GB HDD

I was able to successfully install the latest zone build with the /hp flag.

After booting into the OS with a dedicated drive, I am seeing the loading bar.

About 2/3rd through, the screen turns black and the laptop's fans spin up while

the laptop is getting hot.

I booted with "-v GraphicsEnabler=No"

Are there specific parameters I should at install time outside of the /hp one when instlling? I am using the default install options.

Thanks everyone... :)

post-90179-0-02938500-1418442042_thumb.j

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8 answers to this question

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Try booting with the /amd1 command along with your -v and GraphicsEnabler=No boot flags, this /amd1 command booted my intel ATOM laptop just fine. along with an actual AMD computer.

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@sparkie5571, I tried adding the /amd1 command and end up with a "EHC2: family specific matching fails" error message. It's an i5 Intel processor. Why would I need to add the AMD flag?

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I just booted again with only the -v flag. Same results as the screenshot that I shared in my first post with the exception that I am now getting a value.

 

rooting via boot-uuid from /chosen: 6A14D606-51F4-3B98-95

 

I searched Google for this string but can't find anything that makes sense.

 

Looking at the screenshot, it looks like there are a bunch of ACPI errors.

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Alright, I am giving up. Maverick works fine on this laptop and Yosemite works fine on my tower. Something is going with the Yosemite build for HP laptops.

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If you still planning to try .... Just try this cmd 

 

 

PCIRootUID=1
PCIRootUID=0
PCIRootUID=4

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I found the culprit at another forum. The HP i-* laptops need the cpus=1 flag. I haven't seen this one listed on this forum yet but it works. So, looks like the Yosemite build from Niresh does not account for some of the HP (or all?) laptops.

 

I ended up creating a new build with UniBeast and the actual Yosemite download from the App Store and added the flags I needed. Works like a charm. :)

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i sugest you type other boot flags, i don't remember exactly what i've type, but, i've already install Mavericks and Yosemite on AMD,, with some bugs, i could' fix, but, i get it install and with no issues on boot,,,i'll came back to post the other boot flags you should type,,try to make a search on youtube, you'll probably find those boot flags,,

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