Mac OS X 10.6.8 USB Port

my wired keyboard doesn't pick anymore when i connect it directly to my Mac OS X 10.6.8 usb port but it picks when i connect it to the usb extension cable which connects to the same port (weird huh!) but WHY is that? wired-mouse is working fine.
Mac OS X 10.6.8 USB Port

Hello magicbamboo,
Thanks for using Apple Support Communities.
To troubleshoot this issue where your USB keyboard is not being recognized when directly connected to your Mac, please start with the first article below.  If the issue persists after the first article, continue with the second article below.
USB and FireWire Quick Assist - Apple Support
None of the keys on my keyboard work - Apple Support
Take care,
Alex H.

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