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what is AHT? is it hard to pull a hard drive out? can I use an external hard drive as the hard drive?

I have a macbook 2.1ghz with OSX 10.5.8 running with 4gb of 667mhz DDR2 Recently I have been getting spinning beach balls of death on a constant biases. They come when I try to open web pages such as google, youtube, espn.com... ANYTHING actually. They come when I try to open applications...