Can't Boot into Yosemite AFTER Multibeast

Hello

I was able to install Yosemite and boot with the USB made from Unibeast, but after running Multibeast I'm not able to boot using neither the USB or the HD itself. It keeps getting stuck at the screen shown in the attachment. What's strange is I've had this issue before when I upgraded to Mavericks, and last time I was able to fix by booting the the USB and running Multibeast but I've had no such luck this time around.

I know it's getting stuck at USBMSC identifier but the last time I had this problem, it wasn't actually related to any USB device. Also, this time around I wasn't even able to find some of the kexts that it seemed to be getting stuck on (AppleViaATA, rtl81xx, io80211family, etc)

Any ideas what could be causing this?

Thank you!

So actually I did find the Realtek kext and moved it out of S/L/E for now but that didn't fix the issue, it just froze sooner (see attached)

This was basically the pattern with my Mavericks install until at one point I booted from USB using nothing but -v and GraphicsEnabler=Yes and was able to get in. For some reason this time around that fix is not working.

vkashat said:

So actually I did find the Realtek kext and moved it out of S/L/E for now but that didn't fix the issue, it just froze sooner (see attached)

This was basically the pattern with my Mavericks install until at one point I booted from USB using nothing but -v and GraphicsEnabler=Yes and was able to get in. For some reason this time around that fix is not working.

Click to expand...

Give a try with "dart=0 PCIRootUID=1 GraphicsEnabler=Yes -v"

Thanks for the help

I tried that and the same thing happened. I also tried disabled the virtualization option from the BIOS and that didn't fix it either. Both times I used the exact boot flags you recommended. I attached the result (basically the same as the previous attempt).

Bump

Any other ideas as to why this would happen? Especially since I was originally able to boot after the initial update? I'm wondering what Multibeast option broke it...

Thanks again for any help, any other ideas I can try? I'd love to get this to boot...

Try booting with "npci=0x2000" or "npci=0x3000" along with "dart=0 PCIRootUID=1 GraphicsEnabler=Yes -v -f ".

Good Luck...!

Thanks again for the reply

I tried that once with npci=0x2000 and another time with npci=0x3000 and had the same result as above. It's strange because the boot just stops, it doesn't exactly freeze. For example, if I plug in or disconnect USB devices, I got more "USBMSC identifier" messages, which tells me it isn't completely frozen, just halted. I've given it a long time (hours) when I dealt with this with Mavericks but it never moves past this screen.

Out of curiosity, I tried to boot into the USB Yosemite installer. I was successful only using GraphicsEnabler=Yes

Is there something I can do within the installer? Would re-installing fix it?

vkashat said:

Thanks again for the reply

I tried that once with npci=0x2000 and another time with npci=0x3000 and had the same result as above. It's strange because the boot just stops, it doesn't exactly freeze. For example, if I plug in or disconnect USB devices, I got more "USBMSC identifier" messages, which tells me it isn't completely frozen, just halted. I've given it a long time (hours) when I dealt with this with Mavericks but it never moves past this screen.

Click to expand...

Try booting with flag "USBBusFix=Yes -v GraphicsEnabler=Yes npci=0x2000 dart=0 PCIRootUID=1 -f "