The dreaded Restart Screen

Question

My PB has gotten into the habit of requiring a restart every 30 minutes or so. I'll be working and the dreaded grey/black screen comes down saying that I need to restart my computer (the one with the power image). I've rebuilt the drive twice using Disk Warrior. I've also checked the computer several times using Disk Genius. They both keep telling me that there are no problems, but still the dreaded screen returns. I attempted to take my laptop to my local Apple store, but there was at least a 3 hour wait. Is there any advice you can offer?

Answer 1

Here is the last one before I turned it on to answer your question.
Fri Apr 7 12:47:08 2006
panic(cpu 0 caller 0x000A8D80): Uncorrectable machine check: pc =
0000000000907AC0, msr = 0000000000149030, dsisr = 40000000, dar =
0000000004F21000
AsyncSrc = 0000000000000000, CoreFIR = 0000000000000000
L2FIR = 0000000000000000, BusFir = 0000000000000000
Latest stack backtrace for cpu 0:
Backtrace:
0x00095718 0x00095C30 0x0002683C 0x000A8D80 0x000A8010 0x000ABD00
Proceeding back via exception chain:
Exception state (sv=0x2DE08500)
PC=0x00907AC0; MSR=0x00149030; DAR=0x04F21000; DSISR=0x40000000;
LR=0x00907AB8; R1=0x0F96BBD0; XCP=0x00000008 (0x200 - Machine check)
Backtrace:
0x00907AB8 0x008F9928 0x009252D4 0x00908434 0x0090C8AC 0x0092107C
0x002D0940 0x002CF808 0x000A9894
Kernel loadable modules in backtrace (with dependencies):
com.apple.iokit.AppleAirPort2(404.2)@0x8e2000
dependency: com.apple.iokit.IONetworkingFamily(1.5.0)@0x5ff000
dependency: com.apple.iokit.IOPCIFamily(1.7)@0x47c000
Exception state (sv=0x27BA4500)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000;
LR=0x00000000; R1=0x00000000; SCP=0x00000000 (Unknown)
Kernel version:
Darwin Kernel Version 8.6.0: Tue Mar 7 16:58:48 PST 2006;
root:xnu-792.6.70.obj~1/RELEASE_PPC
This is the very last one (the one that appeared when I turned on my computer today):
Sat Apr 8 12:53:52 2006
panic(cpu 0 caller 0x000A8D80): Uncorrectable machine check: pc= 0000000000900B40, msr = 0000000000149030, dsisr = 40000000, dar = 00000000E0879464
AsyncSrc = 0000000000000000, CoreFIR = 0000000000000000
L2FIR = 0000000000000000, BusFir = 0000000000000000
Latest stack backtrace for cpu 0:
Backtrace:
0x00095718 0x00095C30 0x0002683C 0x000A8D80 0x000A8010 0x000ABD00
Proceeding back via exception chain:
Exception state (sv=0x240DB280)
PC=0x00900B40; MSR=0x00149030; DAR=0xE0879464; DSISR=0x40000000;
LR=0x00925CF0; R1=0x0F9E3D80; XCP=0x00000008 (0x200 - Machine check)
Backtrace:
0x00000000 0x00925CF0 0x0003C744 0x000A9894
Kernel loadable modules in backtrace (with dependencies):
com.apple.iokity.AppleAirPort2(404.2)@0x8e2000
dependency: com.apple.iokit.IONetworkingFamily(1.5.0)@0x5ff000
dependency: com.apple.iokit.IOPCIFamily(1.7)@0x47c000
Exception state (sv=0x23CC5C80)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000;
LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
Kernel version:
Darwin Kernel Version 8.6.0: Tue Mar 7 16:58:48 PST 2006;
root:xnu-792.6.70.obj~1/RELEASE_PPC