my lumia 920 wont start even though the charger is plugged in, why?

[Windows Central Question]

my phone had been working really slow since the last few hours so i turned it off planning to restart it, the battery at the time of shutdown was 7%, once turned off i pressed the power button again, the lights lit up, and i went to the kitchen,i come back its black again, so considering the battery drained i plug in the charger, and its still black, not even the charging sign on the empty battery is appearing. help please. is it bad?

 

[xandros9]

Hard to say, make sure the charger you're using is known good still.