Damaged CPU after cooler change? Severe kernel panic with AICPM.kext

[jsahlen]

I'm having a bit of trouble after exchanging the cooler on my CPU. I had a fully working system with the following components:

• Asus P8H77-i
• Intel Core-i3 2105
• OS X Mavericks 10.9.1

After I had made the cooler switch and plugged everything back in, everything looks good in UEFI BIOS – CPU is detected as before, and showing temps 10°C less than before. Yay, right? Well, when I try to boot OS X, after loading kexts, I get a kernel panic. I can't get in in even in safe mode, so I'm copying this from a photo – sorry for any mistakes:

[…] (things went very quickly here so I can't see the complete log on my screen)


 Intel (R) Core(TM) i3-2105 CPU @ 3.10GHz
 7 error-reporting banks
Processor 0: IA32_MCG_STATUS: 0x0000000000000005
 IA32_MC5_STATUS(0x415): 0xbe20000000041136
 IA32_MC5_ADDR(0x416):   0x000000000d874ec0
 IA32_MC5_MISC(0x417):   0x000000030e000086
Processor 1: IA32_MCG_STATUS: 0x0000000000000005
 IA32_MC5_STATUS(0x415): 0xbe20000000041136
 IA32_MC5_ADDR(0x416):   0x000000000d874ec0
 IA32_MC5_MISC(0x417):   0x000000030e000086
Processor 2: IA32_MCG_STATUS: 0x0000000000000005
 IA32_MC5_STATUS(0x415): 0xbe20000000041136
 IA32_MC5_ADDR(0x416):   0x000000000d874ec0
 IA32_MC5_MISC(0x417):   0x000000030e000086
Processor 3: IA32_MCG_STATUS: 0x0000000000000005
 IA32_MC5_STATUS(0x415): 0xbe20000000041136
 IA32_MC5_ADDR(0x416):   0x000000000d874ec0
 IA32_MC5_MISC(0x417):   0x000000030e000086
panic(cpu 2 caller 0xffffff80002dc6b9): "Machine Check at 0xffffff7f8196fb29, register:\n" "CR0: 0x000000000001003b, CR2: 0x000
0000000000000, CR3: 0x0000000000342000, CR4: 0x00000000000606e0\n" "RAX: 0x0000000000000001, RBX: 0xffff
Debugger called: <panic>
Backtrace (CPU 2), Frame : Return Address
0xffffff80e05e5e80 : 0xffffff8000222fa9
0xffffff80e05e5f00 : 0xffffff80002dc6b9
0xffffff80e05e6060 : 0xffffff80002f3bcf
0xffffff80e6663d70 : 0xffffff7f81960663
0xffffff80e6663e70 : 0xffffff7f8195f899
0xffffff80e6663f30 : 0xffffff80002dd6ec
0xffffff80e6663f50 : 0xffffff80002375ba
0xffffff80e6663f90 : 0xffffff8000237908
0xffffff80e6663fb0 : 0xffffff80002d6ff7
      Kernel Extensions in backtrace:
         com.apple.driver.AppleIntelCPUPowerManagement(216.0)[70947979-EA9B-39D1-AD15-CDAB19F031AF]@0xffffff
7f8195d000->0xffffff7f8198ffff


BSD process name corresponding to current thread: kernel_task
Boot args: -v  slide=0


Mac OS version:
Not yet set


Kernel version:
Darwin Kernel Version 13.1.0: Thu Jan 16 19:40:37 PST 2014; root:xnu-2422.90.20~2/RELEASE_X86_64
Kernel UUID: 9FEA8EDC-B629-3ED2-A1A3-6521A1885953
System model name: Macmini5,1 (Mac-8ED6AF5B48C039E1)


System uptime in nanoseconds: 352461156

My first thought was faulty RAM, but I get the same error if I replace my RAM modules with different ones. I also get the same error booting with both Clover (my default bootloader) and Chimera.

Do you think there might be a problem with my CPU? What should be my next step in trying to find out what might be wrong? I'd be extremely grateful for any help you can offer.

 

[jsahlen]

I've since tried booting from my Clover-based installation USB stick, which has NullPCUPowermanagement.kext, with the same result. If it makes a difference

I have no idea what to try next.

 

[jsahlen]

So, haha. For anyone having the same problem… My BIOS settings had been partially reset, including the setting for iGPU memory. I flipped that back to 64 MB, and now the machine boots, as perfectly as ever.