Computer won't boot at all after 10.5.7 update

After installing the 10.5.7 update, and having it hang on the blue screen (as plenty of others did), my mini will not boot past the grey apple logo screen.
I have tried rebooting several times as this seemed to help some others, as well as holding down the Shift key to boot in safe mode, all to no avail.
I inserted the OS X install disk, and ran disk and permissions repair multiple times, also to no avail.
What should I do to get OS X up and running again?
Cheers.

Thanks for the tip. I posted a new question under "deciphering panic log" as well. Here's what I found:
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x0000000000000004 PC=0x00000000004984E4
Latest crash info for cpu 0:
Exception state (sv=0x1ad3c000)
PC=0x004984E4; MSR=0x00009030; DAR=0x00000004; DSISR=0x40000000; LR=0x00498574; R1=0x19B039C0; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x004983E0 0x00498368 0x00498E20 0x0049AFB4 0x0049A69C 0x003577C8
0x00357884 0x00348B48 0x0034B0BC 0x0034A1DC 0x000B1DD4
Proceeding back via exception chain:
Exception state (sv=0x1ad3c000)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x19ae5780)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
BSD process name corresponding to current thread: Unknown
Mac OS version:
Not yet set
Kernel version:
Darwin Kernel Version 9.7.0: Tue Mar 31 22:54:29 PDT 2009; root:xnu-1228.12.14~1/RELEASE_PPC
System model name: PowerBook6,5
System uptime in nanoseconds: 39721061252
unloaded kexts:
(none)
loaded kexts:
com.apple.nke.applicationfirewall 1.6.77 - last loaded 729386943
com.apple.driver.AppleKeyLargo 1.7.2f1
com.apple.driver.AppleI2C 4.0.0d2
com.apple.driver.AppleMacRiscPCI 3.4.0
com.apple.driver.AppleCore99NVRAM 1.1.1
com.apple.driver.AppleFlashNVRAM 1.0.5
com.apple.iokit.IOHIDFamily 1.5.5
com.apple.driver.DiskImages 199
com.apple.BootCache 30.4
com.apple.driver.AppleMacRISC2PE 1.8.7d5
com.apple.iokit.IOKeyLargo 1.7.2f1
com.apple.iokit.IOStorageFamily 1.5.6
com.apple.driver.IOPlatformFunction 1.8.7d5
com.apple.iokit.IOPCIFamily 2.6
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x0009CC88 0x0009D63C 0x00029DA0 0x000B0A10 0x000B4278
Proceeding back via exception chain:
Exception state (sv=0x1ad3c000)
PC=0x004984E4; MSR=0x00009030; DAR=0x00000004; DSISR=0x40000000; LR=0x00498574; R1=0x19B039C0; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x004983E0 0x00498368 0x00498E20 0x0049AFB4 0x0049A69C 0x003577C8
0x00357884 0x00348B48 0x0034B0BC 0x0034A1DC 0x000B1DD4
Exception state (sv=0x19ae5780)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
BSD process name corresponding to current thread: Unknown
unloaded kexts:
(none)
loaded kexts:
com.apple.nke.applicationfirewall 1.6.77 - last loaded 729386943
com.apple.driver.AppleKeyLargo 1.7.2f1
com.apple.driver.AppleI2C 4.0.0d2
com.apple.driver.AppleMacRiscPCI 3.4.0
com.apple.driver.AppleCore99NVRAM 1.1.1
com.apple.driver.AppleFlashNVRAM 1.0.5
com.apple.iokit.IOHIDFamily 1.5.5
com.apple.driver.DiskImages 199
com.apple.BootCache 30.4
com.apple.driver.AppleMa`

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Hi @frcraig ,
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Have a great day!
Thank You.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
Gemini02
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Quote from: Supershanks on 12-May-05, 08:28:54
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Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

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