Cannot get sound in Cubase 5

I’ve been trying to use Cubase 5 but can’t get any sound. I want to make music for my videos without recording - I only want to use the “piano-button” feature for making my songs. I am using a pc without any custom audio devices. No M-Audio or anything USB-connected. Only the stock-audiocard in my computer. Is it possible to use Cubase without such?