Default [Q] My WT19i doesnt work

Hello, I have Sony Ericsson WT19i. I instaled SJB 8.0 and recommended kernel, but wifi doesnt work so i change kernel. It si supporting 4.x ROMs based on CM. I flashed it via Flashtool and now i cant start my phone. I hold start button for long time and nothing. If I hold down volume button and then I connect USB, Flashtool find phone in flashmode. Can anyone help me?

Thanks for help