My G4 forces me to shut it down when I copy files.

Question

Hello, yesterday I tried to copy some files and as the transfer was about to be completed, I got halted and a screen message appeared in 4 languages forcing me to shut down the computer. A similar message had only appeared twice in the last couple of months, but I didn't pay any attention, since the system worked fine after restart. (I have been using G4 for more than 8 years).  But now every time I try to copy any kind of files from anywhere to anywhere, just as it is about to be competed, I get the same "shut down" screen. Any ideas how to resolve this, preferably without format? I have many un-backed up files, and I can't transfer them! Thank you very much for your help!
I work with Mac OS X 10.5.8.
This is what I get at the problem details window:
Wed Apr 18 08:41:20 2012
Unresolved kernel trap(cpu 0): 0x700 - Program DAR=0x00000000A0B94310 PC=0x00000000004DCCC8
Latest crash info for cpu 0:
   Exception state (sv=0x29e7e000)
      PC=0x004DCCC8; MSR=0x00089030; DAR=0xA0B94310; DSISR=0x0A000000; LR=0x004DCCC4; R1=0x2A1BA870; XCP=0x0000001C (0x700 - Program)
      Backtrace:
0x004DC604 0x004DC170 0x004DB248 0x004DB13C 0x004E17DC 0x004E0B84
         0x0035DA48 0x004E0AF0 0x0037EDDC 0x0038141C 0x004E0244 0x0037E6D4 0x00094E74 0x0002C100
         0x00024B58 0x000B45CC 0x00000000
      Kernel loadable modules in backtrace (with dependencies):
         com.apple.iokit.IOAudioFamily(1.6.9fc5)@0x4d1000->0x4f0fff
            dependency: com.apple.kext.OSvKernDSPLib(1.1)@0x4cd000
Proceeding back via exception chain:
   Exception state (sv=0x29e7e000)
      previously dumped as "Latest" state. skipping...
   Exception state (sv=0x2a224500)
      PC=0x930561F8; MSR=0x0200F030; DAR=0xA0B94310; DSISR=0x0A000000; LR=0x9305D120; R1=0xBFFFDCF0; XCP=0x00000030 (0xC00 - System call)
BSD process name corresponding to current thread: coreaudiod
Mac OS version:
9L31a
Kernel version:
Darwin Kernel Version 9.8.0: Wed Jul 15 16:57:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_PPC
System model name: PowerMac3,6
System uptime in nanoseconds: 350020573365
unloaded kexts:
com.apple.driver.iTunesPhoneDriver    1.0 - last unloaded 12556625717
loaded kexts:
com.Logitech.Control Center.HID Driver    2.6.0
com.symantec.kext.ips    3.0f36
com.symantec.kext.internetSecurity    1.3.1f7
com.apple.filesystems.msdosfs    1.5.5 - last loaded 10101352079
com.apple.driver.iTunesPhoneDriver    1.0
com.apple.iokit.IOUSBMassStorageClass    2.0.8
com.apple.filesystems.autofs    2.0.2
com.apple.driver.AudioIPCDriver    1.0.6
com.apple.driver.AppleTexas2Audio    2.5.8f1
com.apple.iokit.IOFireWireIP    1.7.7
com.apple.ATIRadeon8500    5.4.8
com.apple.driver.AppleHWClock    1.5.2d0
com.apple.driver.AppleDallasDriver    2.5.8f1
com.apple.driver.AppleFan    1.0.10f1
com.apple.driver.AppleI2S    1.0.1f1
com.apple.driver.AppleUSBMergeNub    3.4.6
com.apple.iokit.SCSITaskUserClient    2.1.1
com.apple.iokit.IOSCSIMultimediaCommandsDevice    2.1.1
com.apple.driver.XsanFilter    2.7.91
com.apple.iokit.IOATAPIProtocolTransport    1.5.3
com.apple.iokit.IOATABlockStorage    2.0.6
com.apple.driver.AppleUSBHub    3.4.9
com.apple.iokit.IOUSBUserClient    3.4.9
com.apple.driver.ApplePMU    2.5.6d2
com.apple.driver.AppleVIA    1.5.1d1
com.apple.driver.KeyLargoATA    1.1.1f1
com.apple.driver.MacIOGPIO    1.3.0d0
com.apple.driver.AppleMPIC    1.5.3
com.apple.driver.AppleCPUThermo    2.0.0a0
com.apple.driver.AppleI2C    4.0.0d2
com.apple.iokit.AppleGMACEthernet    1.5.9f1
com.apple.driver.AppleKauaiATA    1.2.1f4
com.apple.driver.AppleUSBEHCI    3.4.6
com.apple.driver.AppleUSBOHCI    3.4.6
com.apple.driver.AppleFWOHCI    3.9.7
com.apple.driver.AppleKeyLargo    1.7.2f1
com.apple.driver.AppleMacRiscPCI    3.4.0
com.apple.driver.AppleCore99NVRAM    1.1.1
com.apple.security.seatbelt    107.12
com.apple.nke.applicationfirewall    1.6.77
com.apple.security.TMSafetyNet    3
com.apple.BootCache    30.4
com.apple.driver.DiskImages    199
com.apple.driver.AppleMacRIP

Answer 1

Hello,
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at the top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair. Disk Utility checks and repairs the disk."
REpair the other drive also & report any errors.
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for Copy problems in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.