Mouse scrolls up, but not down!

I have a standard Apple mouse on my iMac with the little scrolly button on it. I've had it for some time and I've never been able to scroll down with it.
Is this some wacky Apple design concept or do you think it's not working properly? If not, how do I fix it?
Kind Regards,
Blitz

Hi Blitz Spirit,
Your mouse probably needs cleaning, in your owners manual there are instructions also you find them at:
http://support.apple.com/kb/HT1537
Others have had success by placing a clean sheet of printer paper (normal copier paper) on a table turning over their mouse and vigorously rolling the mouse on the paper to try and dislodge any dirt or particles inside the mouse. This should be done for about 30 seconds.

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