Laptop won't turn on after changing hard disc

Hello. 

Today i changed the old hdd to ssd. But the laptop doesn't start up, no power no beep no light no anything. I tried to press 15 seconds the power button but nothing. Tried to push it 30 second nothing... I removed the ssd repeat the process nothing happened. I tried putting back my old hdd still nothing.. It doesn't get power! I don't have the battery but i have the original charger that works perfect.

Any solutions please?