Is possible to update with this jelly bean version? I have updated my phone with this jelly bean version and when i am rebooting it then it is showing only samsung start screen. I don't get further screen to show my phone start desktop! Please help me. Any suggestions are welcomed!
According to the CyanogenMod Devices Overview page the Samsung Galaxy Ace is not supported by CM9 and CM10. The download page for the Galaxy Ace only has CM7 ROMs and the links for CM9 and 10 lead to their Google Plus post about not supporting first generation Snapdragon devices past the CM7 branch. That post can be seen here.
It looks like someone may have compiled a CM10 "Lite" ROM from the CM source that can be found here and someone at XDA compiled a full ROM here. If you installed either of those I would suggest rebooting into recovery and clearing data, cache, etc. and then try re-flashing the ROM. There's also a list of ROMs in XDA's development forum here.
It seems that you have a boot loop or some other booting problem. You can try clearing Dalvik cache and rebooting.
To clear Dalvik Cache, press and hold home button when phone is booting. This takes you to CWM. Go to Advanced > Wipe Dalvik cache.
If that doesn't fix, data wipe->flash ROM->wipe dalvik cache and reboot. If it still doesn't boot, I suggest reverting to CM7 otherwise.
CM support for Ace is patchy beyond CM7 (I learnt this the hard way after flashing my aunt's phone with an experimental CM9 build).