My friend has an old Powerbook, running OS 10.4.11 that keeps crashing. Here are the details. Any idea why would be greatly appreciated:

Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x000000005B0B6033 PC=0x0000000000040AA4
Latest crash info for cpu 0:
Exception state (sv=0x20877780)
PC=0x00040AA4; MSR=0x00009030; DAR=0x5B0B6033; DSISR=0x40000000; LR=0x00040A70; R1=0x0CE23DA0; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x00390000 0x0007C158 0x000A9714
Proceeding back via exception chain:
Exception state (sv=0x20877780)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x20AE9780)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)

Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x000954F8 0x00095A10 0x00026898 0x000A8204 0x000ABB80
Proceeding back via exception chain:
Exception state (sv=0x20877780)
PC=0x00040AA4; MSR=0x00009030; DAR=0x5B0B6033; DSISR=0x40000000; LR=0x00040A70; R1=0x0CE23DA0; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x00390000 0x0007C158 0x000A9714
Exception state (sv=0x20AE9780)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)

Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC
Model: PowerBook5,2, BootROM 4.7.1f1, 1 processors, PowerPC G4 (1.1), 1.25 GHz, 512 MB
Graphics: ATI Mobility Radeon 9600, ATY,RV350M10, AGP, 64 MB
Memory Module: SODIMM0/J25LOWER, 256 MB, DDR SDRAM, PC2700U-25330
Memory Module: SODIMM1/J25UPPER, 256 MB, DDR SDRAM, PC2700U-25330
AirPort: AirPort Extreme, 405.1 (3.90.34.0.p18)
Modem: LastDash, UCJ, V.92, 4.0, APPLE VERSION 2.6.6
Bluetooth: Version 1.9.5f4, 2 service, 1 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
PCI Card: TXN,PCIXXXX-00, cardbus, PC Card
Parallel ATA Device: MATSHITADVD-R UJ-816
Parallel ATA Device: WDC WD800BEVE-00UYT0, 74.53 GB
USB Device: Bluetooth USB Host Controller, Apple, Inc., Up to 12 Mb/sec, 500 mA