Kernel panics on startup on a MB late 2008

Hi everyone.

After reading dozens of threads about kernel panics I couldn't find any appropriate post.

So you see, I've got a unibody MacBook late 2008 and as the thread name states I'm experiencing kernel panics on startup. The weird thing is, these panics occur totally random and I can't induce them. Usually I have an apple keyboard, apple mouse and a WD 1TB drive (TimeMachine backup) connected via USB plus an external monitor and magsafe power. Even after disconnecting all that stuff I receive kernel panics.

I haven't had any kernel panic during normal operation so far. As soon as I get the system up and running nothing happens. They just keep coming every second or third startup.

There are 9 crash reports in my L/Logs/Diag.Reports. You can see the last kernel panic report here:

Tue Jan 22 16:00:04 2013

panic(cpu 0 caller 0xffffff80102b7bd5): Kernel trap at 0xffffff7f9124f578, type 13=general protection, registers:

CR0: 0x000000008001003b, CR2: 0xffffff80f1c3e000, CR3: 0x0000000012eae000, CR4: 0x0000000000000660

RAX: 0x00000000164aae3d, RBX: 0x01ffff8022416000, RCX: 0x0000000080a4a2ab, RDX: 0x0000000000000000

RSP: 0xffffff80f7443e50, RBP: 0xffffff80f7443e60, RSI: 0x0000000000000002, RDI: 0xffffff8010801ef0

R8: 0x0000000000000001, R9: 0x00000000000003ff, R10: 0xffffffffffffffff, R11: 0x00000000ffffffff

R12: 0xffffff8022416000, R13: 0xffffff8022038100, R14: 0xffffff80223d6100, R15: 0x0000000000000001

RFL: 0x0000000000010246, RIP: 0xffffff7f9124f578, CS: 0x0000000000000008, SS: 0x0000000000000000

Fault CR2: 0xffffff80f1c3e000, Error code: 0x0000000000000000, Fault CPU: 0x0

Backtrace (CPU 0), Frame : Return Address

0xffffff80f7443af0 : 0xffffff801021d626

0xffffff80f7443b60 : 0xffffff80102b7bd5

0xffffff80f7443d30 : 0xffffff80102ce4ed

0xffffff80f7443d50 : 0xffffff7f9124f578

0xffffff80f7443e60 : 0xffffff801063181b

0xffffff80f7443ea0 : 0xffffff801063133e

0xffffff80f7443f30 : 0xffffff801062d2d0

0xffffff80f7443f70 : 0xffffff8010631e99

0xffffff80f7443fb0 : 0xffffff80102b26b7

Kernel Extensions in backtrace:

com.apple.driver.AppleUSBOHCI(5.2.5)[1C94C4BC-B05C-36D4-B1A2-B0BE04A5C620]@0xff ffff7f9124e000->0xffffff7f91260fff

dependency: com.apple.iokit.IOUSBFamily(5.4.0)[C3094550-7F58-3933-A4F7-CD33AE83F8B9]@0xffff ff7f910f8000

dependency: com.apple.iokit.IOPCIFamily(2.7.2)[B1B77B26-7984-302F-BA8E-544DD3D75E73]@0xffff ff7f908af000

BSD process name corresponding to current thread: kernel_task

Mac OS version:

Not yet set

Kernel version:

Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64

Kernel UUID: 69A5853F-375A-3EF4-9247-478FD0247333

Kernel slide: 0x0000000010000000

Kernel text base: 0xffffff8010200000

System model name: MacBook5,1 (Mac-F42D89C8)

System uptime in nanoseconds: 1060195299

last loaded kext at 357954763: com.apple.driver.XsanFilter 404 (addr 0xffffff7f91ea4000, size 20480)

loaded kexts:

com.apple.driver.XsanFilter 404

com.apple.iokit.IOAHCIBlockStorage 2.2.2

com.apple.driver.AppleIntelCPUPowerManagementClient 196.0.0

com.apple.driver.AppleUSBHub 5.2.5

com.apple.driver.AirPort.Brcm4331 602.15.22

com.apple.driver.AppleAHCIPort 2.4.1

com.apple.driver.AppleEFINVRAM 1.6.1

com.apple.driver.AppleSmartBatteryManager 161.0.0

com.apple.nvenet 2.0.19

com.apple.driver.AppleUSBEHCI 5.4.0

com.apple.driver.AppleUSBOHCI 5.2.5

com.apple.driver.AppleRTC 1.5

com.apple.driver.AppleHPET 1.7

com.apple.driver.AppleACPIButtons 1.6

com.apple.driver.AppleSMBIOS 1.9

com.apple.driver.AppleACPIEC 1.6

com.apple.driver.AppleAPIC 1.6

com.apple.nke.applicationfirewall 4.0.39

com.apple.security.quarantine 2

com.apple.driver.AppleIntelCPUPowerManagement 196.0.0

com.apple.iokit.IOAHCISerialATAPI 2.5.0

com.apple.iokit.IOSCSIArchitectureModelFamily 3.5.1

com.apple.iokit.IOUSBUserClient 5.2.5

com.apple.iokit.IO80211Family 500.15

com.apple.iokit.IOAHCIFamily 2.2.1

com.apple.iokit.IONetworkingFamily 3.0

com.apple.iokit.IOUSBFamily 5.4.0

com.apple.driver.NVSMU 2.2.9

com.apple.driver.AppleEFIRuntime 1.6.1

com.apple.iokit.IOHIDFamily 1.8.0

com.apple.iokit.IOSMBusFamily 1.1

com.apple.security.sandbox 220

com.apple.kext.AppleMatch 1.0.0d1

com.apple.security.TMSafetyNet 7

com.apple.driver.DiskImages 344

com.apple.iokit.IOStorageFamily 1.8

com.apple.driver.AppleKeyStore 28.21

com.apple.driver.AppleACPIPlatform 1.6

com.apple.iokit.IOPCIFamily 2.7.2

com.apple.iokit.IOACPIFamily 1.4

com.apple.kec.corecrypto 1.0