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Makemeamac

Stuck at "SMC : Successfully initialized" on boot

Question

I have recently installed OS X Mavericks 10.9.3 on my computer, and everything works great while I'm INSIDE the OS using it. But when it comes to booting up, the screen keeps getting stuck at the grey apple logo screen, with the loading circle infinitely looping until I reboot, only to get the same results over and over. Using verbose mode revealed that the boot process gets stuck at the line "SMC : Successfully Initialized" as shown in the screenshot followed by one or two lines of uninterpretable garbage, until I reboot.?

So far I have tried infinite combinations of kernel flags, but all give the same results (except -x, which boots up OS X but then there's no graphics kext enabled). I tried changing the system definition from "Mac pro 6,1" to 5,1 and even 3,1. But still the same results.?
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Also as an exception, the OS boots successfully if I use "UseKernelCache=No" flag, but then the OS behaves very abnormally and becomes extremely slow, so I avoid that. Even tried deleting and rebuilding kernel cache but problem still persists.
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Sometimes with some real good luck it boots succesfully, but that's pretty rare and obviously unreliable.
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Can somebody please help me on this one? This is real confusing. :concern:
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Thanks

System Specs :?
X-Pro 450W PSU
Galaxy Geforce GT 520 1GB
Gigabyte GA-G41 Combo?
Pentium Dual Core E5500 @4.1 GHz
6 GB (2+4) DDR3
128 GB Toshiba SSD (Boot Drive)
500 GB Seagate Barracuda HDD
LG Supermulti DVD-RW

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