Satellite Pro L450D - Fan starts/stops, constantly on/off

Hi,
I recently purchased this laptop, and the fan is driving me crazy, every time the CPU reaches 55c the fan switches on really loud for a few seconds, until the temp drops to 45c, then the fan switches off entirely, and the cycle repeats itself infinitely.
I have changed the cooling method to battery optimized and it has no effect - http://jkontherun.files.wordpress.com/2009/10/toshiba-nb205-power-options.jpg?w=418&h=448
Why can't the fan stay on permanently @ 30% load and thus negating the need to ramp it up to 100% every time the cpu overheats.
I can't believe such a simple little issue as this even exists.

The cooling method settings just shift temperature thresholds. These changes will never help you to get rid of the annoying ON/OFF fan behavior.
I've received your email. Do you want me to send you the modified BIOS? If you have any additional questions, then please use email but not this forum.

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