HT1476 iphone 4 randomly turned off and wont turn back on

hi my iphone 4 was working perfectly then i left it and wen i came back it was off and had a blank screen i then charged it on the dock which has always worked and still the same screen i left it there for a while and nothing happened same with the computer and adapter help

Plug your phone into a power source
Hold the home button and sleep/wake button simultaneously for about 10 seconds or until you see a silver apple
This is called a hard reset and it should fix your problem

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