Sorry that happened to you. Next time, don't flash a rooted kernel unless the device does not have an app that will do it. You wont get the triangle, and you wont brick the phone. The epic 4g touch does have that app. (http://forum.xda-developers.com/show....php?t=2130276
To fix your problem, go into download mode on the phone and flash the stock kernel (You may need to flash a couple of kernels because there are many different model numbers for the epic 4g touch, such as GC01 EL29, ect.) with odin on your computer. Once you flash the correct kernel, root it with the app I linked above.
Edit: Android 4.0.4 is limited to 4 options when it comes to kernels! FL24, FL27,FH13, and FF18. Try those kernels to flash.