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Black screen while installing mountain Lion on Lenovo G50-80

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Black screen while installing mountain Lion on Lenovo G50-80

Hi everyone

I am kinda new in this procedure. I recently downloaded the Nitesh ML 10.8.5 dmg file and created a bootable USB. When trying to install I used several boot flags but none of them seem to work. When the installation begins, it just goes into a black screen after the first step when using -v or else just stuck at Apple logo without the verbose mode. Kindly help. Really need this to work.

P.s. I have also tried installing Mavericks, and Yosemite too but end up in the same loop as mentioned above


video for your reference 


my specs

Lenovo G50-80

i5 -5200U CPU @ 2.2 GHZ

12 gb ddr 3 ram 

500 gb hdd 


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