My phone keeps won't turn on.

[Android Central Question]

My phone keeps showing me this message

"Warning !!
A custom OS can cause critial problems in phone and installed applications.
If you want to download a custom OS, press the volume down key to cancel.

Volume up : continue

Volume down : cancel (restart phone)"

So far I only tried the volume down and I ended up with a black screen. When I push the turn on/turn off button it doesn't do a thing.

Can anyone help me figure this out?

Thank you!!

 

[B. Diddy]

Welcome to Android Central! Which phone?