Fixing Fan Noise Created Keychain and Connectivity Problem

This will kind of be long so bare with me...
I occasionally will get the dreaded "fan running out of control/noise" scenario with my Power Mac G5 Dual 2Ghz (Mac OS 10.5.6). I usually run through the usual steps, re-set PMU switch, re-set nvram, run repairs with Disk Utility, boot up under a different startup disk, etc. Eventually something works and the fan returns to normal. This time around none of those steps worked but after 20 minutes the fan went back to normal by itself. Go figure...
At the same time this was happening, my computer would not connect to the Internet. The router's (which is connect to a cable modem) status lights said I was connected but my computer could not automatically get the DHCP information nor could it reach the router's control panel via Safari. I have a PC also hooked up and it was connecting to Internet fine and it was able to access the router's control panel via Firefox. At this point, I was hoping the ethernet hardware was not going bad.
Not only that, I could not access my keychain formation. When I selected any items and tried to show password, it gave me the error message about unable to access keychain item. I ran First Aid on the Keychain and it reported no problems.
My main startup disk is running Mac OS 10.5.6. This version of the OS has been running fine for the past couple of days before all this happened. I have a second startup disk which has Mac OS 10.4.x installed. I tried to boot up with that startup disk (OS 10.4.x) and the computer was able to connect to the Internet fine. That ruled out the hardware. I booted up with the main disk (OS 10.5.6) again. Surprisingly enough I had Internet connectivity again. My keychain was almost back to normal. The only problem is that for any item I select to show password for, a pop up window appears saying "Keychain Access wants to user your confidential information stored in "xxxxx" in your keychain. Once I select the Always Allow button the information is displayed.
So my questions are:
1. Why did my computer "refuse" to connect to the internet in this odd manner?
(BTW -- I am using OpenDNS with the router, could this have contributed to the connectivity issue?)
2. Why did booting up with a different startup disk seemingly corrected the problem?
3. In the Keychain, is there a way to apply "Always Allow" as a group instead of one by one?
4. Is this an unforeseen side effect of updating to OS 10.5.6?
5. Could any of this have been avoided?
Thanks.
Message was edited by: Carlton Chin
Message was edited by: Carlton Chin

FYI to all the helpful folks here (and any looking to shut their jet engine off as well): Flashing the BIOS did the trick.
First I had to find a website with DOS OS files and put those on the USB instead of Vista. Oldie but a goodie, but at least it booted! No other versions would.
I had been intending to use the WinPhlash utility that Lenovo supplied with the BIOS update but since I was booting from DOS that was useless. However, I found a DOS version of it and used that instead. Boom baby! Flashed and rebooted.
It did take two boots to get it back to normal (first one gave very alarming messages about no operating system being found but I think it was just a remnant of the reboot that was triggered from the DOS session). A second boot returned life to normal and blissful silence from the server. And I was finally able to get the model and serial number back in there to get rid of the bootup message it throws for that too.
Ahhhhhhh.
Thanks to all for the hints - I believe I had gotten the idea of flashing the BIOS to solve this from some other thread I found here. This is a very nice forum to have bookmarked.

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