my rooted galaxy s3 wont turn on

[Ili Shpati A]

I have a galaxy s3 and i rooted it. i downloaded root manager and one customt rom. when i tryed to turn it off and put it in recovery mode it didnt give a signal. i took off battery and pulled it back on but nothing, i connected the charger and the led light didnt show i took off battery again and connected the charger. the led light showed off. i dont know what to do now if u have any suggestion pls tell me