Well some motherboards have reset buttons on them. Although opening up your case to push it would be time consuming. But pushing the power button wont hurt your computer, it will just make it go through the whole posting procedure. And in the days of hard drives this was a time consuming proposition because it too so long for the hd to come up to speed and load the os. But now with the ssd on board the whole process takes maybe 15-20 seconds nowadays. So using the power button to reset your computer isn't a big deal anymore.