Now that I've isolated the problem...

...what exactly do I do next?
My computer was crashing all the time in Tiger. Usually kernel panic sort of stuff. I upgraded to Leopard (archive and install), and it's gotten a bit better. But it still crashes much more than it should. I've isolated the problem -- basically, if I plug any USB or Firewire device in, I can expect a crash pretty soon, with the computer freezing up. (If I just plug in the keyboard, it seems to be OK. The printer is usually OK, but once or twice the computer has frozen up with just the keyboard and printer plugged in.)
People always tell you to isolate the problem, which I've done. But the question is, what do you do next? I would've figured that installing a new System folder would've corrected the problem, but it hasn't. Of course, I can wipe the hard drive and put everything back on (I can occasionally get an external hard drive running without a freeze for long enough to run Time Machine), but why would that other stuff (aside from the System Folder) affect what I plug into the back of the computer?
Anyway, I imagine I should do what I suggested above, right? Once I have a good recent Time Machine back-up, wipe the hard drive? Or is my computer just too old and underpowered (although that wouldn't explain all the crashes in Tiger, really)
Thanks!

Hey Barry,
Appreciate your help. I archived and installed when I went to Leopard, so I don't think that'll help. And my drive is Verified in Disk Utility. I just plugged in my FireWire drive to do a Time Machine back-up, and the system crashed a few minutes later. Here's the log report:
Wed Apr 9 16:00:26 2008
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x00000000747344BD PC=0x00000000000362BC
Latest crash info for cpu 0:
Exception state (sv=0x1dbbe280)
PC=0x000362BC; MSR=0x00001030; DAR=0x747344BD; DSISR=0x40000000; LR=0x000362BC; R1=0x1D7B3980; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x01D0F750 0x000369E4 0x00036BDC 0x0001EEC4 0x000249A0 0x002EA8C8
0x000B05D4
Proceeding back via exception chain:
Exception state (sv=0x1dbbe280)
previously dumped as "Latest" state. skipping...
Exception state (sv=0xf74c80)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
BSD process name corresponding to current thread: kernel_task
Mac OS version:
9C7010
Kernel version:
Darwin Kernel Version 9.2.2: Tue Mar 4 21:23:43 PST 2008; root:xnu-1228.4.31~1/RELEASE_PPC
System model name: PowerMac6,3
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
backtrace terminated - frame not mapped or invalid: 0x1D7B3680
Proceeding back via exception chain:
Exception state (sv=0x1dbbe280)
PC=0x000362BC; MSR=0x00001030; DAR=0x747344BD; DSISR=0x40000000; LR=0x000362BC; R1=0x1D7B3980; XCP=0x0000000C (0x300 - Data access)
Backtrace:
backtrace terminated - frame not mapped or invalid: 0x1D7B3980
Exception state (sv=0xf74c80)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
Mean anything to you? I'm going to use Drive Genius to continue the search for the problem. You have any other ideas as to how I'd locate a hardware problem?
Thanks again.

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