El Capitan install from usb stuck at boot
If you have access to another mac, try this. Hold down the T key during boot on the mac with new hard drive installed. This will put that machine in target boot mode. 

Connect the two Macs with either a fire wire cable or a thundbolt cable. 

On the 2nd mac run the El Capitan installer. When asked where to install the OS point it at the other mac (with new hard drive installed) which should now be seen in finder. If it does not show up in finder. Launch disk utility and format the drive. 

It sounds as if the USB installer is broken. However as long as you have access to another mac you do not need to make another usb installer. Just download El Capitan from the app store and follow the above instructions.