Just upgraded to Leopard now I get constant kernal panics!

Question

I just upgraded my G4 PPC to 10.5.8. I can do things okay on my computer for a while then it does the kernal panic. All updates have been done except the prokit 5 one (I use logic and the last upgrade messed with it). Could this be causing the issue? Here is the info. I hope someone can help so I can start doing more recording!
Problem details:
Interval Since Last Panic Report: 30666 sec
Panics Since Last Report: 4
Anonymous UUID: F98F9AD1-0F29-4550-B70C-4FB39A16DEF7
Tue Dec 29 09:03:24 2009
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x0000000007000010 PC=0x000000002A451B80
Latest crash info for cpu 0:
Exception state (sv=0x2a59b000)
PC=0x2A451B80; MSR=0x00009030; DAR=0x07000010; DSISR=0x40000000; LR=0x2A452D04; R1=0x243EF9C0; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x00000000 0x2A452D04 0x2A45B37C 0x2A45CE80 0x2A459D3C 0x2A43F9E0
0x0037BFA0 0x00381A08 0x00381B58 0x00090654 0x0002C100 0x00024B58 0x000B45CC 0x656C6572
Kernel loadable modules in backtrace (with dependencies):
com.apple.ATIRadeon8500(5.4.8)@0x2a435000->0x2a47afff
dependency: com.apple.iokit.IONDRVSupport(1.7.3)@0x2a0ba000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x24310000
dependency: com.apple.iokit.IOGraphicsFamily(1.7.3)@0x2a1c4000
Proceeding back via exception chain:
Exception state (sv=0x2a59b000)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x2422b500)
PC=0x91AC91F8; MSR=0x0200F030; DAR=0x153B5000; DSISR=0x40000000; LR=0x91AD0120; R1=0xF0739090; XCP=0x00000030 (0xC00 - System call)
BSD process name corresponding to current thread: Safari
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: 4543408706419
unloaded kexts:
com.apple.driver.AppleFCU 1.3.2b0 - last unloaded 5750925730
loaded kexts:
com.Projovian.driver. XRackSATA16 1.2
com.apple.filesystems.autofs 2.0.2 - last loaded 2333446369
com.apple.driver.DiskImages 199
com.apple.driver.AppleFCU 1.3.2b0
com.apple.driver.AppleTexasAudio 2.5.8f1
com.apple.driver.AppleFan 1.0.10f1
com.apple.driver.AppleTexas2Audio 2.5.8f1
com.apple.driver.AudioIPCDriver 1.0.6
com.apple.driver.AppleSlewClock 1.5.2d0
com.apple.driver.AppleADT746x 1.0.10f1
com.apple.driver.AppleSCCSerial 1.3.2
com.apple.iokit.AppleGMACEthernet 1.5.9f1
com.apple.driver.AppleDACAAudio 2.5.8f1
com.apple.iokit.IOFireWireIP 1.7.7
com.apple.ATIRadeon8500 5.4.8
com.apple.driver.AppleVSP 2.2.2
com.apple.driver.AppleThermal 1.0.1f2
com.apple.driver.AppleHWClock 1.5.2d0
com.apple.driver.AppleDallasDriver 2.5.8f1
com.apple.driver.AppleADM103x 1.0.10f1
com.apple.driver.InternalModemSupport 2.4.0
com.apple.driver.AppleI2S 1.0.1f1
com.apple.driver.AppleFileSystemDriver 1.1.0
com.apple.iokit.IOUSBHIDDriver 3.4.6
com.apple.driver.AppleUSBMergeNub 3.5.2
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.1.1
com.apple.iokit.SCSITaskUserClient 2.1.1
com.apple.driver.XsanFilter 2.7.91
com.apple.iokit.IOATABlockStorage 2.0.6
com.apple.driver.AppleUSBHub 3.4.9
com.apple.iokit.IOUSBUserClient 3.5.2
com.apple.iokit.IOATAPIProtocolTransport 1.5.3
com.apple.driver.ApplePMU 2.5.6d2
com.apple.driver.AppleFWOHCI 3.9.7
com.apple.driver.AppleKauaiATA 1.2.1f4
com.apple.driver.AppleUSBOHCI 3.4.6
com.apple.driver.AppleGPIO 1.3.0d0
com.apple.driver.MacIOGPIO 1.3.0d0
com.apple.driver.AppleMPIC 1.5.3
com.apple.driver.AppleVIA 1.5.1d1
com.apple.iokit.AppleMediaBay 1.0.0
System config
Model: PowerMac3,6, BootROM 4.4.8f2, 1 processor, PowerPC G4 (3.3), 1.25 GHz, 1.25 GB
Graphics: kHW_ATIrv250Item, ATY,RV250, spdisplaysagpdevice, 64 MB
Graphics: kHW_ATIrv280Item, ATY,RV280, sppcipcidevice, 128 MB
Memory Module: DIMM0/J21, 512 MB, DDR SDRAM, PC2600U-25330
Memory Module: DIMM1/J22, 512 MB, DDR SDRAM, PC2600U-25330
Memory Module: DIMM2/J23, 256 MB, DDR SDRAM, PC2600U-25330
Modem: Dash2, UCJ, V.92, 1.0F, APPLE VERSION 2.6.7
Network Service: Ethernet, Ethernet, en0
PCI Card: XRack SUA-100 Rev.1.7, scsi, SLOT-2
PCI Card: ATY,RV280, display, SLOT-4
Parallel ATA Device: _NEC DVD+RW ND-1100A
Parallel ATA Device: ST31000333AS, 931.51 GB
Parallel ATA Device: ST340014A, 37.27 GB
Parallel ATA Device: ST3120026A, 111.79 GB
USB Device: Hub in Apple Extended USB Keyboard, (null) mA
USB Device: Macally Optical iceMouse, (null) mA
USB Device: Apple Extended USB Keyboard, (null) mA

Answer 1

First, I would disconnect all peripherals except the original Apple keyboard and mouse. Boot the computer into safe mode if possible and do the following:
Repairing the Hard Drive and Permissions
Boot from your currently installed OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger and Leopard.) After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
Now, you did not indicate if this upgrade to 10.5.8 was from an earlier version of Leopard or if you first upgraded to Leopard then to 10.5.8 using the combo updater. I'm assuming the former, so after you've done the above repairs reinstall the 10.5.8 Combo Updater. If you did not use a Combo Updater, then you can download it from support.apple.com/downloads/.
If the above doesn't help then I would suggest reinstalling OS X as follows:
How to Perform an Archive and Install
An Archive and Install will NOT erase your hard drive, but you must have sufficient free space for a second OS X installation which could be from 3-9 GBs depending upon the version of OS X and selected installation options. The free space requirement is over and above normal free space requirements which should be at least 6-10 GBs. Read all the linked references carefully before proceeding.
1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.
Repairing the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger.) After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported, then quit DU and return to the installer.
2. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.
3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.
5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.
6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.
And, if the above doesn't help start looking at the probability of bad RAM.