iMac G5 Death Throes

The iMac G5 named iFive, which I boot without a keyboard, is in its death throes: it crashed again while booting up. Power supply issue? This time, I could save the report to Apple. Reporting didn't work until I plugged in a USB mouse. So, here it is: Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x0000000000000038 PC=0x000000000005FDD8 Latest crash info for cpu 0: Exception state (sv=0x4DE32280) PC=0x0005FDD8; MSR=0x00009030; DAR=0x00000038; DSISR=0x40000000; LR=0x0005DEB4; R1=0x1CEF3C70; XCP=0x0000000C (0x300 - Data access) Backtrace: 0x02C9E424 0x00062538 0x00063344 0x000A865C 0x000ABB80 backtrace terminated - frame not mapped or invalid: 0xBFFFF890 Proceeding back via exception chain: Exception state (sv=0x4DE32280) previously dumped as "Latest" state. skipping... Exception state (sv=0x4DCCEC80) PC=0x8FE23CE8; MSR=0x0000D030; DAR=0x8FE49424; DSISR=0x40000000; LR=0x8FE23CA4; R1=0xBFFFF890; XCP=0x0000000C (0x300 - Data access) 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=0x4DE32280) PC=0x0005FDD8; MSR=0x00009030; DAR=0x00000038; DSISR=0x40000000; LR=0x0005DEB4; R1=0x1CEF3C70; XCP=0x0000000C (0x300 - Data access) Backtrace: 0x02C9E424 0x00062538 0x00063344 0x000A865C 0x000ABB80 backtrace terminated - frame not mapped or invalid: 0xBFFFF890 Exception state (sv=0x4DCCEC80) PC=0x8FE23CE8; MSR=0x0000D030; DAR=0x8FE49424; DSISR=0x40000000; LR=0x8FE23CA4; R1=0xBFFFF890; XCP=0x0000000C (0x300 - Data access) 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: PowerMac8,1, BootROM 5.2.2f2, 1 processors, PowerPC G5 (3.0), 1.6 GHz, 768 MB Graphics: GeForce FX 5200, GeForce FX 5200, AGP, 64 MB Memory Module: DIMM0/J4000, 256 MB, DDR SDRAM, PC3200U-30330 Memory Module: DIMM1/J4001, 512 MB, DDR SDRAM, PC3200U-30330 Modem: Jump, V.92, Version 1.0 Network Service: Built-in Ethernet, Ethernet, en0 Serial ATA Device: ST3300620AS, 279.46 GB Parallel ATA Device: MATSHITACD-RW CW-8123 USB Device: General Purpose USB Hub, Up to 12 Mb/sec, 500 mA USB Device: External HD, Iomega, Up to 12 Mb/sec, 500 mA USB Device: USB Device, Up to 12 Mb/sec, 500 mA USB Device: Kensington USB/PS2 Wheel Mouse, Kensington, Up to 1.5 Mb/sec, 500 mA