最近經常無預警當機...... - MAC

最近常發生無預警出現五國畫面之後當機重開機,
當機之前也沒有特別操,
上禮拜做過AHT也沒有任何異常,
這幾天當機的頻率越來越高了,
實在有一點困擾不知道哪裡出錯了@@a
機型是2010 iMac 27" OS是mountain lion 10.8.2
以下是重開機之後出現的訊息:

Interval Since Last Panic Report: 2026817 sec
Panics Since Last Report: 7
Anonymous UUID: AE7CD4D7-21B2-8A33-830C-6846BF724582

Tue Nov 6 22:58:16 2012
Panic(CPU 0): NMIPI for spinlock acquisition timeout, spinlock:
0xffffff80415e3270, spinlock owner: 0xffffff8043b86000, current_thread:
0xffffff8043b86000, spinlock_owner_cpu: 0x0
RAX: 0x00000000000000fe, RBX: 0xffffff8043e0c080, RCX: 0xa9ff379d00000000,
RDX: 0xffffff81f36e6000
RSP: 0xffffff81e1ee8ec0, RBP: 0xffffff81e1ee8f40, RSI: 0xffffff81e1ee8ef8,
RDI: 0xffffff8043e0c080
R8: 0x0000000000000051, R9: 0x00000000000003ff, R10: 0xffffffffffffffff,
R11: 0x00000000ffffffff
R12: 0xffffff81e1ee8ef8, R13: 0xffffff8043df6580, R14: 0xffffff8043e23000,
R15: 0xffffff81e1ee8f08
RFL: 0x0000000000000087, RIP: 0xffffff7fa24ab046, CS: 0x0000000000000008,
SS: 0x0000000000000010
Backtrace (CPU 0), Frame : Return Address
0xffffff81e1ee8d40 : 0xffffff8020ebd371
0xffffff81e1ee8d70 : 0xffffff8020eb7203
0xffffff81e1ee8dc0 : 0xffffff8020ece81b
0xffffff81e1ee8f40 : 0xffffff7fa1451825
0xffffff81e1ee8f50 : 0xffffff7fa2ae962d
0xffffff81e1ee8f60 : 0xffffff7fa2af0b5b
0xffffff81e1ee8f80 : 0xffffff8020eb720f
0xffffff81e1ee8fd0 : 0xffffff8020ece6a8
0xffffff81f35bbe60 : 0xffffff8020e12233
0xffffff81f35bbe90 : 0xffffff8020e192b2
0xffffff81f35bbf00 : 0xffffff8020e19724
0xffffff81f35bbf70 : 0xffffff8020ea5b16
0xffffff81f35bbfb0 : 0xffffff8020eced53
Kernel Extensions in backtrace:
com.apple.iokit.IOPCIFamily(2.7.2)[B1B77B26-7984-302F-BA8E
-544DD3D75E73]@0xffffff7fa1450000->0xffffff7fa1474fff
com.apple.driver.AppleACPIPlatform(1.6)[4F08531B-7E5A-3604
-924A-8769CF53458B]@0xffffff7fa2ae3000->0xffffff7fa2b39fff
dependency: com.apple.iokit.IOACPIFamily(1.4)[A35915E8-C1B0-3C0F
-81DF-5515BC9002FC]@0xffffff7fa18eb000
dependency: com.apple.iokit.IOPCIFamily(2.7.2)[B1B77B26-7984-302F
-BA8E-544DD3D75E73]@0xffffff
Model: iMac12,2, BootROM IM121.0047.B1F, 4 processors, Intel Core i5, 3.1 GHz,
16 GB, SMC 1.72f2
Graphics: AMD Radeon HD 6970M, AMD Radeon HD 6970M, PCIe, 1024 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0198,
0x393930353432382D3034352E4130304C4620
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0198,
0x393930353432382D3034352E4130304C4620
Memory Module: BANK 0/DIMM1, 4 GB, DDR3, 1333 MHz, 0x0198,
0x393930353432382D3034352E4130304C4620
Memory Module: BANK 1/DIMM1, 4 GB, DDR3, 1333 MHz, 0x0198,
0x393930353432382D3034352E4130304C4620
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A),
Atheros 9380: 4.0.70.23-P2P
Bluetooth: Version 4.0.9f33 10885, 2 service, 18 devices, 1 incoming
serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: WDC WD1001FALS-403AA0, 1 TB
Serial ATA Device: HL-DT-STDVDRW GA32N
USB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x850b,
0xfa200000 / 3
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: iPhone, apple_vendor_id, 0x1294, 0xfa120000 / 5
USB Device: EZ100PU Smart Card Reader, 0x0ca6 (Castles Technology Co. Ltd.),
0x0010, 0xfa130000 / 6
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 4
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215,
0xfa111000 / 7
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: My Book 1140, 0x1058 (Western Digital Technologies, Inc.),
0x1140, 0xfd140000 / 5
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfd110000
/ 4
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 3

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