[Q] S4 screen doesn't turn on, have to pull battery

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http://forum.xda-developers.com – Hi, Got my S4 yesterday. All seemed to be working OK until this morning. I charged it up to 100% and then the screen wouldn't turn on, either by the power button or the home button. There was a blue light flashing at the top so the phone wasn't completely dead. I tried holding the power button down for a while to shut it down but nothing happened. I removed/reinserted the battery and booted up fine. The phone then worked OK for about 2 hours, and then I noticed there was a blue LED light again so I thought I had a notification. Then when I tried to turn on the screen the same thing (HowTos)