https://community.sony.hr/t5/z-series/screen-didn-t-light-up/m-p/3322983#M40660 It could be due to the app. Where you using a preloaded app or a third-party app? Mon, 12 Jan 2015 22:02:02 GMT Phy 2015-01-12T22:02:02Z https://community.sony.hr/t5/z-series/screen-didn-t-light-up/m-p/3322982#M40659 Today as I was listening to the radio (thru an app), i wanted to unblock it and the screen didn't react, I could rise and lower the volume and I tried to plug it to the charger and the light that appears when charging, worked too but the screen kept being black.<BR />I finally decided to press the little red button next to the Sim card and the phone started working fine again, in fact I'm writting from the device, but i wanted to know if I shud worry about this happening (it was the first time ever), or maybe was it because it heated up because I used the radio app too much?( I used it during the morning for like 2,5h and in the afternoon 2h more... Mon, 12 Jan 2015 21:57:16 GMT https://community.sony.hr/t5/z-series/screen-didn-t-light-up/m-p/3322982#M40659 Elisabet1988 2015-01-12T21:57:16Z https://community.sony.hr/t5/z-series/screen-didn-t-light-up/m-p/3322983#M40660 It could be due to the app. Where you using a preloaded app or a third-party app? Mon, 12 Jan 2015 22:02:02 GMT https://community.sony.hr/t5/z-series/screen-didn-t-light-up/m-p/3322983#M40660 Phy 2015-01-12T22:02:02Z https://community.sony.hr/t5/z-series/screen-didn-t-light-up/m-p/3322984#M40661 The app belongs to a radiostation, so I guess is a third-party app? Mon, 12 Jan 2015 22:09:42 GMT https://community.sony.hr/t5/z-series/screen-didn-t-light-up/m-p/3322984#M40661 Elisabet1988 2015-01-12T22:09:42Z https://community.sony.hr/t5/z-series/screen-didn-t-light-up/m-p/3322985#M40662 Yes, that would be a third-party app. And more than likely the issue is caused by that app. Try contacting the app developer regarding the issue. Mon, 12 Jan 2015 22:14:02 GMT https://community.sony.hr/t5/z-series/screen-didn-t-light-up/m-p/3322985#M40662 Phy 2015-01-12T22:14:02Z