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I have a similar issue. I'm using an antec earthwatt PSU and I only hear the noise when I boot into OS X. When I had W7 installed I had none of these issues. From everything I've read it is a bad capacitor or possibly the fan.

Nevermind disabling AppleGraphicsController.kext did it. Thanks for the help!

I don't see AppleGraphicsManagement.kext but I do see AppleGraphicsController.kext. Is that that one I should delete?

Hey everyone, I recently installed using the iBoot + Multibeast guide. I used the DSDT for the Gigabyte P55M-UD2 and everything except the sound worked flawlessly. My 9800GT was recognized perfectly and animations seem fluid. I would like to play some valve and blizzard games but when I run TF2...

My machine is identical to yours and I'm getting the same noise. What is your memory running at? I have 1333 dual channel DDR3 showing as 667 DDR2.

This is my post from the main iBoot/Multibeast thread but haven't had much help yet.

Hmm... I bought a new hard drive because most of my research pointed to the hard drive, yet I still get the same errors. Last night I did have sort of an epiphony. I am trying to load os x with a blu-ray/dvd-rom drive. Could that be the issue?

Bump? Forgot to mention I am using a EVGA 9800GT located in the express x16 slot. Also I tried upgrading my bios to F8 and F5 (which tony uses in his guide) to no prevail. I did have windows installed on the hard drive but I formatted it and still have issues.

I have a EVGA 9800GT. I am using the Nvidia version located in the iBoot + Multibeast guide on the blog. Thanks for your reply.

Noob looking for some help. I've been researching what I'm doing wrong all afternoon but still haven't found the solution. My problem is during the install my screen with iboot goes from a blue-grey to all black and the apple disappears. After that I get "CPU halted" and it shuts off. If I try...

Noob looking for some help. I've been researching what I'm doing wrong all afternoon but still haven't found the solution. My problem is during the install my screen with iboot goes from a blue-grey to all black and the apple disappears. After that I get "CPU halted" and it shuts off. If I try...