Frequent system freezing. Restart computer message, followed by beeps during startup

For the past few weeks I've been having repeated crashes on my MBpro 4.1, with OSX 10.6.8, fully updated. The system randomly freezes and I have to force a restart. Sometimes the system does not restart but gives a series of beeps remaing on black screen. If I let it rest a while it then starts properly.

I did a complete reformat and fresh install with only the basic software I need but the problem has not been resolved.

I have already tried changing the memory modules, without solving the problem.

Any kind advice would be greatly appreciated! Thanks.

ooInterval Since Last Panic Report: 96747 sec

Panics Since Last Report: 2

Anonymous UUID: 5B15A9F4-1502-4E18-8DF1-5960113BDBAB

Mon Feb 25 19:02:13 2013

panic(cpu 0 caller 0x2abf6a): Kernel trap at 0x5bef6f30, type 14=page fault, registers:

CR0: 0x8001003b, CR2: 0x8c558b88, CR3: 0x00100000, CR4: 0x00000660

EAX: 0x46d04005, EBX: 0x00010005, ECX: 0x46d04004, EDX: 0x00010001

CR2: 0x8c558b88, EBP: 0x5c15b4e8, ESI: 0x00000000, EDI: 0x00000000

EFL: 0x00010206, EIP: 0x5bef6f30, CS: 0x00000008, DS: 0x017e0010

Error code: 0x00000000

Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)

0x5c15b238 : 0x21b837 (0x5dd7fc 0x5c15b26c 0x223ce1 0x0)

0x5c15b288 : 0x2abf6a (0x59e3d0 0x5bef6f30 0xe 0x59e59a)

0x5c15b368 : 0x2a1a78 (0x5c15b380 0x0 0x5c15b4e8 0x5bef6f30)

0x5c15b378 : 0x5bef6f30 (0xe 0x48 0x5c150010 0x10010)

0x5c15b4e8 : 0x5bef895b (0x0 0x0 0x10000 0x1)

0x5c15b578 : 0x5bef8fcc (0xa803804 0x0 0x0 0x10000)

0x5c15b9e8 : 0x315981 (0x8867784 0x71f2f80 0x7b7cb64 0x0)

0x5c15ba48 : 0x3175ce (0x0 0x0 0x10000 0x0)

0x5c15bb18 : 0x42e6d5 (0x5c15bbbc 0x5c15bb7c 0xa373b64 0x0)

0x5c15bb98 : 0x2ff592 (0x5c15bbbc 0x3 0x5c15bbe8 0x58a167)

0x5c15bbe8 : 0x2f4d98 (0x8867784 0x5c15bc2c 0x8 0x5c15bc68)

0x5c15bc88 : 0x2f4e63 (0x0 0x8867784 0x56cca000 0x0)

0x5c15bce8 : 0x47c8fb (0x0 0x8867784 0x56cca000 0x1000)

0x5c15bec8 : 0x47cbe6 (0x454 0x50 0x4 0x2a45c9)

0x5c15bf38 : 0x47cd4a (0x8e39a80 0x5c15bf50 0x7149804 0x3)

0x5c15bf78 : 0x4f82fb (0x8e39a80 0x6c16a68 0x7149804 0x1)

0x5c15bfc8 : 0x2a251d (0x6c16a64 0x0 0x10 0x6c16a64)

Kernel Extensions in backtrace (with dependencies):

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib(1.0.0d1)@0x5bef5000->0x5befafff

BSD process name corresponding to current thread: launchd

Mac OS version:

10K549

Kernel version:

Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386

System model name: MacBookPro4,1 (Mac-F42C89C8)

System uptime in nanoseconds: 196210018499

unloaded kexts:

(none)

loaded kexts:

1. com.paceap.kext.pacesupport.snowleopard 5.8
2. com.digidesign.iokit.DigiDal 9.0.3f4
3. com.roxio.BluRaySupport 1.1.6
4. com.apple.filesystems.cd9660 1.4.1 - last loaded 150101017708
5. com.apple.driver.AppleHWSensor 1.9.3d0
6. com.apple.filesystems.autofs 2.1.0
7. com.apple.filesystems.msdosfs 1.6.3
8. com.apple.driver.AppleTyMCEDriver 1.0.2d2
9. com.apple.driver.InternalModemSupport 2.6.2
10. com.apple.driver.AudioAUUC 1.57
11. com.apple.driver.AppleIntelYonahProfile 14
12. com.apple.Dont_Steal_Mac_OS_X 7.0.0
13. com.apple.driver.AppleUpstreamUserClient 3.5.7
14. com.apple.driver.AppleIntelPenrynProfile 17
15. com.apple.driver.AppleMCCSControl 1.0.20
16. com.apple.driver.AppleIntelNehalemProfile 11
17. com.apple.driver.AppleHDA 2.0.5f14
18. com.apple.driver.AudioIPCDriver 1.1.6
19. com.apple.driver.AirPortBrcm43xx 423.91.27
20. com.apple.driver.AppleGraphicsControl 2.10.6
21. com.apple.GeForce 6.3.6
22. com.apple.driver.SMCMotionSensor 3.0.1d2
23. com.apple.iokit.AppleYukon2 3.2.1b1
24. com.apple.driver.AppleIntelMeromProfile 19
25. com.apple.driver.AirPortBrcm43224 428.42.4
26. com.apple.driver.ACPI_SMC_PlatformPlugin 4.7.0a1
27. com.apple.driver.AppleLPC 1.5.1
28. com.apple.driver.AppleBacklight 170.0.46
29. com.apple.kext.AppleSMCLMU 1.5.2d10
30. com.apple.driver.AppleUSBTCButtons 201.6
31. com.apple.driver.AppleUSBTCKeyEventDriver 201.6
32. com.apple.driver.AppleUSBTCKeyboard 201.6
33. com.apple.driver.AppleIRController 303.8
34. com.apple.iokit.SCSITaskUserClient 2.6.8
35. com.apple.BootCache 31.1
36. com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
37. com.apple.driver.AppleFWOHCI 4.7.3
38. com.apple.driver.AppleEFINVRAM 1.4.0
39. com.apple.driver.AppleUSBHub 4.2.4
40. com.apple.driver.AppleUSBUHCI 4.2.0
41. com.apple.iokit.IOAHCIBlockStorage 1.6.4
42. com.apple.driver.AppleUSBEHCI 4.2.4
43. com.apple.driver.AppleAHCIPort 2.1.7
44. com.apple.driver.AppleIntelPIIXATA 2.5.1
45. com.apple.driver.AppleRTC 1.3.1
46. com.apple.driver.AppleHPET 1.5
47. com.apple.driver.AppleSmartBatteryManager 160.0.0
48. com.apple.driver.AppleACPIButtons 1.3.6
49. com.apple.driver.AppleSMBIOS 1.7
50. com.apple.driver.AppleACPIEC 1.3.6
51. com.apple.driver.AppleAPIC 1.4
52. com.apple.driver.AppleIntelCPUPowerManagementClient 142.6.0
53. com.apple.security.sandbox 1
54. com.apple.security.quarantine 0
55. com.apple.nke.applicationfirewall 2.1.14
56. com.apple.driver.AppleIntelCPUPowerManagement 142.6.0
57. com.apple.driver.AppleProfileReadCounterAction 17
58. com.apple.driver.AppleProfileTimestampAction 10
59. com.apple.driver.AppleProfileThreadInfoAction 14
60. com.apple.driver.AppleProfileRegisterStateAction 10
61. com.apple.driver.AppleProfileKEventAction 10
62. com.apple.driver.AppleProfileCallstackAction 20
63. com.apple.iokit.IOSurface 74.2
64. com.apple.iokit.IOBluetoothSerialManager 2.4.5f3
65. com.apple.iokit.IOSerialFamily 10.0.3
66. com.apple.driver.AppleHDAHardwareConfigDriver 2.0.5f14
67. com.apple.driver.DspFuncLib 2.0.5f14
68. com.apple.iokit.IOAudioFamily 1.8.3fc2
69. com.apple.kext.OSvKernDSPLib 1.3
70. com.apple.driver.AppleSMBusPCI 1.0.10d0
71. com.apple.iokit.IOFireWireIP 2.0.3
72. com.apple.iokit.AppleProfileFamily 41
73. com.apple.driver.AppleHDAController 2.0.5f14
74. com.apple.iokit.IOHDAFamily 2.0.5f14
75. com.apple.iokit.IO80211Family 320.1
76. com.apple.iokit.IONetworkingFamily 1.10
77. com.apple.driver.IOPlatformPluginFamily 4.7.0a1
78. com.apple.driver.AppleBacklightExpert 1.0.1
79. com.apple.driver.AppleSMC 3.1.0d5
80. com.apple.nvidia.nv50hal 6.3.6
81. com.apple.NVDAResman 6.3.6
82. com.apple.iokit.IONDRVSupport 2.2.1
83. com.apple.iokit.IOGraphicsFamily 2.2.1
84. com.apple.driver.BroadcomUSBBluetoothHCIController 2.4.5f3
85. com.apple.driver.AppleUSBBluetoothHCIController 2.4.5f3
86. com.apple.iokit.IOBluetoothFamily 2.4.5f3
87. com.apple.driver.AppleUSBMultitouch 207.7
88. com.apple.iokit.IOUSBHIDDriver 4.2.0
89. com.apple.driver.AppleUSBMergeNub 4.2.4
90. com.apple.iokit.IOSCSIBlockCommandsDevice 2.6.8
91. com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.6.8
92. com.apple.iokit.IOBDStorageFamily 1.6
93. com.apple.iokit.IODVDStorageFamily 1.6
94. com.apple.iokit.IOCDStorageFamily 1.6.1
95. com.apple.iokit.IOUSBMassStorageClass 2.6.7
96. com.apple.driver.AppleUSBComposite 3.9.0
97. com.apple.driver.XsanFilter 402.1
98. com.apple.iokit.IOATAPIProtocolTransport 2.5.1
99. com.apple.iokit.IOSCSIArchitectureModelFamily 2.6.8
100. com.apple.driver.AppleFileSystemDriver 2.0
101. com.apple.iokit.IOFireWireFamily 4.2.6
102. com.apple.iokit.IOUSBUserClient 4.2.4
103. com.apple.iokit.IOUSBFamily 4.2.4
104. com.apple.iokit.IOAHCIFamily 2.0.6
105. com.apple.driver.AppleEFIRuntime 1.4.0
106. com.apple.iokit.IOATAFamily 2.5.1
107. com.apple.iokit.IOHIDFamily 1.6.6
108. com.apple.iokit.IOSMBusFamily 1.1
109. com.apple.security.TMSafetyNet 6
110. com.apple.kext.AppleMatch 1.0.0d1
111. com.apple.driver.DiskImages 289.1
112. com.apple.iokit.IOStorageFamily 1.6.3
113. com.apple.driver.AppleACPIPlatform 1.3.6
114. com.apple.iokit.IOPCIFamily 2.6.5
115. com.apple.iokit.IOACPIFamily 1.3.0

Model: MacBookPro4,1, BootROM MBP41.00C1.B03, 2 processors, Intel Core 2 Duo, 2.4 GHz, 4 GB, SMC 1.27f3

Graphics: NVIDIA GeForce 8600M GT, GeForce 8600M GT, PCIe, 256 MB

Memory Module: global_name

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8C), Broadcom BCM43xx 1.0 (5.10.131.42.4)

Bluetooth: Version 2.4.5f3, 2 service, 12 devices, 1 incoming serial ports

Network Service: AirPort, AirPort, en1

Serial ATA Device: FUJITSU MHY2200BH, 186.31 GB

Parallel ATA Device: MATSHITADVD-R UJ-867

USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x1a100000 / 2

USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x820f, 0x1a110000 / 4

USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8502, 0xfd400000 / 2

USB Device: Microsoft Notebook/Mobile Optical Mouse 2.0, 0x045e (Microsoft Corporation), 0x007d, 0x1d100000 / 2

USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0x5d100000 / 3

USB Device: Apple Internal Keyboard / Trackpad, 0x05ac (Apple Inc.), 0x0231, 0x5d200000 / 2