Stack Overflow is for programmers, Super User is for computer hardware & software enthusiasts and power users.  You want to ask questions about code, go to SO. If you're having a problem with booting your laptop, go to SU.

Read the FAQs of both SU and SO to understand more.

>[Stack Overflow **FAQ**](http://stackoverflow.com/faq).  

>[Super User **FAQ**](http://superuser.com/faq)