After I replaced the button ribbon on my Lumia 625, why won't my phone turn on?

[Windows Central Question]

Replaced Button ribbon on Lumia 625 and phone won't turn on

Hi Folks,

The volume button on my lumia 625 broke so i ordered a new button ribbon and replaced it. When i tried to turn on the phone, i got nothing. So i switched back to the old ribbon to check if the issue was related and the phone turned on. Next, i tried to power on the phone with the old ribbon, and replaced it while it was still on, the new ribbon worked perfectly (the power button also locked and unlocked the screen) so i decided to turn the phone off again and try to turn it back on. Guess what, Nothing.

Can someone help me solve this issue ?

Any suggestions would be greatly appreciated

Thanks.