MMy son and inare setting up a raspberry pi for the first time. I'm not computer savvy and he is keen to learn. We got things working ok and got to the boot to desktop option but unfortunately we also selected the option that made Scratch the main feature. Now we can't get it to the main home screen. We quit scratch and it tells us the system will shut down in 5 seconds unless we push contrl c which we do but nothing happens. Can anyone help us?