plz help

[PerazaJonathan]

hello i tried installing cyanogen mod 7.2.0 and everything goes well except for when it reboots to finish installation nothing happens as if the rom was never installed idk what to do plz help!!!

 

[PerazaJonathan]

nvm the last comment i retried to install rom and when it said to reboot into clockwordmod recovery to continue the
installation i got a picture of a yellow exclamation mark inside a white triangle next to a picture of a phone nothing happens
what do i do???? i think i messed up my phone