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I have a Samsung Galaxy S5 I was using in McDonalds on their free wi-fi. I slide down the notifications to check some download and accidentally swipped the screen dimmer all the way to the bottom without realizing it. Instant black screen.
I thought maybe the battery had gone dead. So I hooked it up to the charger when I got home. It was kinda dark where I plugged it and I noticed the screen was not black but very dim. Then I realized what had happened.
I don't know if your phone has a similar dimmer slider in the notification slide-down but if it does this might be what happened to yours. The key is to look at your phone in a dark place.
I solved this problem few times by completely opening my HTC Desire Z mobile phone and then reassembling it. Third time, I noticed that the problem is due to looseness of two, out of three, tiny screws at the "camera" button of the mobile set. Therefore, mobile set was not properly pressed and sealed at the "Camera" button and due to some protection by HTC, screen went black. Now I have used new relatively long tiny screws and the problem is solved permanently.
Best and easiest way is to just re-flash the phone with the latest software. However this will cause all your data to be wiped clean from the phone. If you can not afford to loose your data, then connect it to Blackberry desktop with a usb cable and play around with the phone to see if you get luck and it connect to your computer. If so then make a backup before reflashing the phone
may be there is some problem with battery try putting any of ur frnd s handset compatible battery in to it and just have cross check ... may be the battery is dead due some indeed things like overcharging or bcoz of heating effect.... may be power on button inside is gone... or the charging ic is gone.... if problem persists then contact the technician ... this simple problem he will not charge more than 300 ..