On all keyboards. This keyboard is one of those. You'll need a slightly better PS2 to USB adapter like this one -> http://www.amazon.com/Adesso-Adapter-connects-connectors-ADP-PU21/dp/B00008ZPED/ref=dp_cp_ob_e_title_0
I purchased a new Desktop - Inspiron 546 MT- because my wife likes the keyboard from the old Dell computer I pluged it in. I get a error message--device not recognized. The keyboard, Dell Model # SK-8000, was working just fine with the old computer. Note to connect it I had to use an Adaptor-PS/2 Female to USB AM. I called Dell unable to resolve problem; indicate they will get back to me.