Charging battery and high CPU usage - Help!

I just picked up a new notebook and am having a weird problem with high CPU usage.
When I run on battery power there is no problem. CPU usage is fine and I can use applications as I would expect.
As soon as I plug in the AC charger the CPU usage jumps up to 20-40% and if I open IE it jumps to 90-100%. It takes more than 30 seconds for a window to open. Using any application is incredibly sluggish. If I unplug the charger the problem goes away immediately.
Any help appreciated.
Specs below:

Inspiron 6400 Pentium Dual Core T2130 (1.86Ghz, 1MB L2 Cache, 533Mhz)

Windows XP SP2


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Re: Charging battery and high CPU usage - Help!

Have been in touch with Dell Support.
Have tried repair with Win XP CD
Have done a restore back to setup that was shipped
Have re-installed the BIOS
Have performed a Full Diagnostic (using F12 at boot up) - Passes all tests
Still have the problem...
Has anyone else ever experienced this?
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