My s3 wont boot, not even to the recovery!

So i have a galaxy s3 and it not rooted or anything, i left it on the chair, came back 15 min later, passed the lock screen the pulled the notifaction bar down and it shut off, it wont turn on with the power button but if i take the battery out and put it back in it boots for a sec and says Samsung then it turns off but sometimes it will get to where it says Galaxy S III and 2 times it gotn to the moving samsung part. Ive tried to go to recovery and it got to the actual recovery 1s but then it said error and shut off