I have a yamaha dgx-300 keyboard, and lost the power cable to it about a year ago. Do any stores like circuit city or something carry a power cord that would be compatible with my keyboard?
what type of power cord does it use? if its a regular ac input, you could just use any ac plug with the correct amount of power <-- this isn't the recommended choice, just a posibility.
Here are two adapters for your keyboard, your manual or a sticker on the keyboard, should tell you which one you need.