Thanks for your input. After about 30-40 tries the phone rebooted. I don't think it was a battery problem since it had been on charge for over 24 hrs. However, after the bootloader screen I tried the UBports loader program and have successfully installed UT on the Nexus 4. I was suprised that it worked, because yes, the phone was completely unresponsive.
Best posts made by mooncosmique
RE: bricked Nexus 4?