Default [Q] s2 GT-i9100G goes black screen during reboot

Hi everyone,
I own galaxy S2 GT-i9100G which I rooted and tried to flash with a new custom rom i.e CM 10....When installation is complete and tries to reboot my phone goes black screen. Can someone help me with the right kernel to flash. how can i make my phone reboot without it going to black screen.
I am worried......