Did you install the correct CWM for this model? A recovery has to be built for the specific model of phone, so if you used the wrong file it can mess things up badly. If you think there's any possibility that this is the wrong recovery then proceed immediately to my final suggestion below.
My first suggestion would be to pull the battery and then try again, or see if you can boot into recovery and try wiping the cache partition (but only if you are sure it's the correct recovery). If all else fails try to reflash the phone with official firmware (which will likely erase all data on it). If it's a Samsung then you should be able to find the firmware at sammobile.com, and I believe you use a Samsung app called Kies to flash it, but as I've never done this with a Sammy I can't provide more than that.