Flash Boot.Img. This might solve the bootloop!
I think, You just need to flash the boot.img (available in the Cynogen Bundle Zip Folder) after installing Cynogen Mod. Me too got stuck on the animation part for a long time. Then I found out this:
CyanogenMod builds for endeavoru currently do NOT support any bootloader version number below: HBOOT 1.28. As the device is S-ON (security-on bootloader), for a working installation you must extract the boot.img from the installer zip and run fastboot flash boot boot.img from fastboot mode.
Source: Cynogen Mod Wiki