Akai MPK mini MIDI Controller Keyboard, 25-Key ... my keysare broken from were it clips on

I see no reason why not...but that will depend what part of the country you are in...where are you located???

Its a lot simplifier than that really.. all you need to do is unsolder the old one and re-solder the new one.. The pins and connectors are standard.

yes

Try here
http://www.akaipro.com/products/keyboard-controllers/lpk-25

what is the problem.. please use english

no sound well it has to be used w something from garageband reason, etc u cant just plug it in and play it . so for instance garage band , you wanted the grand piano u open the grand piano and start hitting the keys. should be no problem I have the same one

It should work as a generic midi controller if it isn't listed

This is likely a software you are using with this is either not compatible with those particular controllers OR is not set up to use those controllers. Someplace those need to be mapped into whatever you are trying to control with the knobs.

Make sure to plug it in before you start up the application. Make sure you restarted your computer after installing device.
Did you check system preferences to see the output settings?
I have mine set to output as headphones and have some external speakers in them. If I unplug them the computers speakers turn right on automatically.

Your machines are different and likely have different interface chipsets. Some newer machines have more built in plug-n-play than others. There is so much incompatibility that it is a wonder that any of the stuff works together. You need to install the needed driver... NOTE: there is a lot of incompatibility between OS versions... so if for instance you are using XP on one machine and Vista or Windows 7 on the other there are a LOT of incompatibilities. ALWAYS check the requirements for the computer with the specs of the device to be connected. MOST of the problems are due to OS variations. Check for driver updates on the Sony site