[Q] z1c wont turn on topic

Hi all,

I have a problem with my z1 compact.

It suddenly turned off and wont turn on.
Non of the buttons give a reaction.
I alsof tried power+volume up but but nothing.
When i connect it to a charger or computer only the red ligt is solid on.
I did not use it in water or something.
Bootloader was unlucked and custom recovery and ROM.

What can i do??

Thanks