My phone won't turn on

My Samsung phone has gone black. I tryed everything to get it back working. I have taken the battery out and left it for a while i have tryed rebooting it (volume up button, home button and on/off button) also left it on the charge for 2 days and 2 nights. This isn't an old phone. Has anyone had the same troubles with this phone? I would be forever greatful if you could help. As most people my phone is my everything. Thanks <3