Exclamation [Q] Xperia sola screen black during boot

Hi everyone, i'm a new user!
During the installation of a new ROM, when i flashed Cyanogenmod 9.1 rom, my phone had some problems because of a wrong ROM
Now the screen is off, the LEDs do not work, but the phone will turn on (it vibrates when I press the power button). Probably is on but does not display anything.
How do I run the flashtool, if my phone does not turn off (and therefore can not go into flash mode)?
Thank you