Quelqu'un sait-il décrypter ce petit rapport d'erreur ?

Bonjour,
Ayant de gros problèmes avec mon Mac OSX 10.5, dont l'image est brouillée et qui plante sans arrêt (sauf en mode sans échec), je voulais savoir si quelqu'un était assez calé pour décrypter un tout petit peu ce rapport d'erreur que j'ai eu ce soir suite à un plantage-redémarrage... notamment pour savoir si le problème vient de la carte mère ou d'un conflit d'extension... Mille merci d'avance pour votre temps et pour votre aide ! :)

Interval Since Last Panic Report: 0 sec
Panics Since Last Report: 1
Anonymous UUID: 57E32BF3-E5CF-4324-AD08-4524C191C0B5

Thu Oct 22 19:48:57 2015
panic(cpu 0 caller 0x27CDDA58): "Apparent UniNorth Hang: AGP STATUS = 0x00000006
"@/SourceCache/xnu/xnu-1228.15.4/iokit/Kernel/IOLib.cpp:724
Latest stack backtrace for cpu 0:
Backtrace:
0x0009CC88 0x0009D63C 0x00029DA0 0x27CDDA58 0x27CE527C 0x27CE9D68 0x27CD322C 0x27CE41BC
0x27CE5170 0x27CEA1B4 0x27CD2A20 0x27CC0268 0x27C9DEE8 0x0037BFA0 0x00381A08 0x00381B58
0x00090654 0x0002C100 0x00024B58 0x000B45CC 0xF1F3F3F3
Kernel loadable modules in backtrace (with dependencies):
com.apple.GeForcePPC(5.4.8)@0x27c80000->0x27d1bfff
dependency: com.apple.iokit.IONDRVSupport(1.7.3)@0x1e5b3000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x1e614000
dependency: com.apple.NVDAResmanPPC(5.4.8)@0x330cc000
dependency: com.apple.iokit.IOGraphicsFamily(1.7.3)@0x1e716000
Proceeding back via exception chain:
Exception state (sv=0x275a2780)
PC=0x93DB9078; MSR=0x0200F030; DAR=0x049D7548; DSISR=0x42000000; LR=0x93DBFFA0; R1=0xBFFFE530; XCP=0x00000030 (0xC00 - System call)

BSD process name corresponding to current thread: WindowServer

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: PowerMac8,1

System uptime in nanoseconds: 264758708655
unloaded kexts:
com.apple.driver.Apple02DBDMAAudio 2.5.8f1 - last unloaded 7641912549
loaded kexts:
com.apple.filesystems.autofs 2.0.2 - last loaded 1943050891
com.apple.driver.AppleOnyxAudio 2.5.8f1
com.apple.driver.InternalModemSupport 2.4.0
com.apple.driver.AppleTexasAudio 2.5.8f1
com.apple.driver.DiskImages 199
com.apple.driver.MotorolaSM56K 1.3.9
com.apple.driver.AppleTexas2Audio 2.5.8f1
com.apple.GeForcePPC 5.4.8
com.apple.driver.AppleDACAAudio 2.5.8f1
com.apple.driver.AppleSCCSerial 1.3.2
com.apple.driver.AudioIPCDriver 1.0.6
com.apple.driver.PowerMac8_1_ThermalProfile 3.4.0d0
com.apple.driver.AppleI2S 1.0.1f1
com.apple.driver.AppleLM7x 1.9d0
com.apple.iokit.IOFireWireIP 1.7.7
com.apple.driver.AppleVSP 2.2.2
com.apple.driver.AppleSEP 1.3.0
com.apple.driver.AppleK2Driver 1.7.2f1
com.apple.driver.AppleHWSensor 1.9d0
com.apple.driver.AppleSMUMonitor 1.9d0
com.apple.AppleOnboardDisplay 1.15.1
com.apple.nvidia.nv30hal 5.4.8
com.apple.iokit.AppleGMACEthernet 1.5.9f1
com.apple.iokit.IOUSBHIDDriver 3.4.6
com.apple.driver.ApplePulsar 1.5.2d0
com.apple.driver.AppleCPUThermo 2.0.0a0
com.apple.driver.AppleUSBMergeNub 3.5.2
com.apple.driver.AppleFileSystemDriver 1.1.0
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.iokit.IOATAPIProtocolTransport 1.5.3
com.apple.driver.AppleUSBHub 3.4.9
com.apple.iokit.IOUSBUserClient 3.5.2
com.apple.driver.AppleK2SATA 1.0.4f2
com.apple.driver.AppleGPIO 1.3.0d0
com.apple.driver.MacIOGPIO 1.3.0d0
com.apple.driver.AppleMPIC 1.5.3
com.apple.driver.AppleI2C 4.0.0d2
com.apple.driver.AppleUSBEHCI 3.4.6
com.apple.driver.AppleUSBOHCI 3.4.6
com.apple.driver.AppleFWOHCI 3.9.7
com.apple.driver.AppleKauaiATA 0