Non-responsive Keyboard & Mouse on language select screen

[JMWRainwater]

Hello geniuses,

 

I have scoured InsanelyMac, OSx86, and even, yes, "the site that must not be named," but I cannot find a solution within my immediate knowledge for my problem. 

 

After many tinkerings, I am finally able to get to the language selection screen (first screen in the OS X 10.8 installation process). Much to my dismay, neither my keyboard nor my mouse are responsive. If I leave the screen idle for some time (approx. 8 min) it goes blank white, but hitting the power button seems to wake it up, and I'm back at the language selection screen.

 

I am following this guide to install Mountain Lion (OS 10.8) onto my rig. 

My boot function (is that the right word) is as follows:

 

-v GraphicsEnabler=No -f

 

My rig is as follows:

 

Obsidian 660T Case
ASRock Z77 Xtreme 4
i7 3770k 
32gb RAM (4x 8gb)
2TB HDD, 256gb SSD, 128gb SSD (with Windows 8 already installed on 1 TB. My plan is to install OS X onto the 256 SSD)
2x GeForce GTX 660 ti 3gb SLI (although I've disabled them for now via BIOS, using only the onboard graphics - HDMI hooked up to the motherboard)

Dedicated Sound card onboard
Blu Ray burner/Reader 12x
Wifi/Bluetooth Card

Extremities:

Monitor: 27" Samsung HDMI 1920X1080 monitor 2hz refresh rate

Keyboard: SteelSeries Merc USB Wired 

Mouse: Razer DeathAdder

 

I have already deleted the 

nVidia* files from the /Extensions folder, as well as /Caches/com.apple.kext.caches/Startup/Extensions.mkext

 

I have tinkered around with Kext Wizard to see if I need to install a driver that is recognized at installation, but honestly cannot figure out what to correctly add. 

 

Help me InsanelyMac. You're my only hope.

[Laberlohe]

Hello and welcome!

 

At first: I'm no genius and it'd better if I'm noones only hope

 

Did you connect your keyboard and mouse via the blue USB 3.0 ports? Afaik are these only working natively on Gigabyte motherboards, while mobo from all other vendors will need a driver/kext. Possible solution: plug them to the (black) USB 2.0 ports.

 

If this won't help, try to tinker around with the bios settings for UEFI/legacy devices. (My last ASRock mobo was a 939 Dual SATA - so I'm quite outdated regarding their bioses and correct names for the switches inside them)

 

Good luck!