[help please] Nexus 4 not booting past animation screen

Hi, doing this for a friend whose Nexus 4 was stuck at the boot screen. Tried many things but even now still stuck at the boot screen.

1) unlocked bootloader
2) installed custom recovery (tried both twrp and cwm)
3) tried installing 3-4 different custom ROM's but for each of those, it does not go past the boot screen

What am I doing wrong?

Thanks in advance

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