Why won't my computer turn on?

My mac book air won't turn back on.. It was on one second working fine, I closed it to carry it to my room, opened it and it wouldn't turn on. I've tried resetting all the different things such as the SMC and nothing happens. However, the light on the MagSafe charge does change colors. When I plug in the charger it lights up as if it's working and charging. I'm not sure what the issue could be. At one point I did get it to turn on, but the cursor wouldn't move so I tried to reset it resulting in me permanently not being able to turn it on.. Thanks.