Hot Powerbook G4 & power supply

My Powerbook G4 15-inch is about 5 or 6 years old, and just recently both the power supply and the computer get very hot when they are plugged in. Both would get hot in the past, but not like this: painful to have on your lap, hot. It is not the battery that is getting hot on the computer - the location of the heat is more under the keyboard and towards the edge of near the screen (and I just bought a new battery for the computer about 4 months ago). I am wondering if this is the early warning of the computer starting a downward decline.
Thanks,
Garp

Run this Temperature Monitor Application by Marcel Bresink Software
http://www.bresink.de/osx/TemperatureMonitor.html
It's the greatest little digital temp monitor that runs at top of screen edge.
I've used it for over a year. This is by far the best one.
I've tried others at Apple that never performed.
After you monitor the heat range of the processor a few times, you will have abetter idea of what to expect.
Viewing video from Youtube, or Apple's training will run the temp up to 151 degrees.
Or converting RAW images in Aperture to file.
Apples training http://www.apple.com/aperture/tutorials/#adjustedit-recover example test.
Idle, waking up will see temps of 80.
I run a quiet blower moving air under the laptop to help out if I hear laptop fan start.
On lap or other areas, it's easy to block or restrict airflow and it will run hot.
Using a lap pad available online works great. Helps keeping laptop in place as well.
If power supply is running too hot, it's best to just replace it.
There are plenty of reports, including mine made a difference.
Make sure to use the 3 prong grounded power cord adaptor to supply rather than the folding 2 prong adaptor. There is a weak point inside the 2 prong adaptor.
Plug power supply to wall outlet first, then laptop.
When you hear arcing, plugging power supply into wall outlet, this is normal.
Hearing multiple arcs is danger mode.
This arcing can spike laptop if it's plugged in at laptop first if you have sloppy fitting wall outlets
using the flip out 2 prong adaptor.

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