Originally Posted by holmes4
That should be fine as long as the plug fits.
It is also important to make sure the polarity on the plug end is the same. You can do this by checking the polarity diagram.
The diagram has a - sign, an open circle, then a + sign. The open circle opens in the direction of polarity, so if the break in the circle is towards the + sign, then it is a positive polarity tip.
Some electronics can cope with reverse polarity better than others. Typically they will just not work. However, some devices like LCD inverters for instance, instantly release the magic jeanie smoke.
Polarity is not required for the device to function, however to properly eliminate interference and noise it is suggested to use the correct polarity to ensure there are no problems.
I do not have the Mini powercord in front of me, but every laptop powercord I have ever seen is DC output.
FYI, for anyone looking for a replacement powercord. The voltages have to match exactly or very very close. The amperage can be as high, or higher than the stock amperage. The output is polarized and should also be matched (DC this is required, AC this is suggested).