Wierd new system crash

Yesterday I had two system crashes where there was text written within a black box background written over what was on the screen when the computer froze. I didn't write down what was on the screen, but noted that one of the lower lines had 'Darwin' written on it. On looking through various posts and web pages about 'kernel panics', it seems like this might be what happened. Only thing is, the pages state that kernal panic screens on systems using os x above 10.3 have a benign screen telling you how to restart your system. One of the help pages I found says that around os x 10.1 or something like that had the black text box with white or light lettering like I had. I am using 10.4.7. I had run techtool pro 4.1.2 and all was fine except for the number of nodes being used which is often off a little, and after techtool had finished optimizing files and was waiting for input from me (while it was booted up under the e-drive) it had another freeze. Today I ran techtool pro again booted to the edrive, while it was running I started apple's disk utility and had it verify permissions; there were two 'fetchmail' permissions that were off, and were then repaired/returned to the normal state. All other testing showed positive results.
It seems like my machine had a 'kernel panic', but there is no panic.log in my system/library/logs folder area. Also during the panic it showed an old-style display on the screen. Is this a normal thing under os x 10.4.7, and why wouldn't there be a panic.log file? I recently remember that while trying to use excel from office x for mac the excel application just quit a few times and no message was displayed when it quit. Was this a symptom also of a 'kernal panic'?
all help appreciated,
charles
imac g3 slot-loading and powerbook 5,8 g4 15" 1.67ghz Mac OS X (10.4.7)

Hi cufford,
Have you added any RAM recently? RAM is the leading cause of KP's. KP's also can manifest themselves in a variety of ways.
Dr. Smoke has a whole site devoted to resolving them.
http://thexlab.com/faqs/kernelpanics.html
Joe

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They're both on the same ide cable. It's been setup this way for quite some time. One drive is setup as a master, the other as a slave. Never had any problems for the past couple of years. Issue just started about a month ago. Don't recall anything that may have triggered it. Just one night when I was sitting there, the whole thing froze. Ever since then, it has been freezing sporatically. Now it's doing it about every 2 minutes from when I get it booted up...if I can even get it to boot. Most of the time it just sits on a grey screen, then goes to the blinking folder with the system face and question mark, then after about 20 seconds of that, it eventually boots into the system drive and freezes or boots to the cd. It's completely random from what I can tell, as to which happens.

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