Screen isn't lighting up

view story

http://forum.xda-developers.com – I have a slight issue. My wife's evo 3d screen is no longer coming on. Her phone is HTC Dev Unlocked. Battery is charged, and it doesn't matter if I try to get into bootloader, recovery, or just try to power the phone on. The capacitive buttons light up like they should, but the screen on the phone does not come on. I'm guessing that the light fr the screen went out. So, here's the problem. Can I return he phone under warranty with it being unlocked? I know unlocking would normally void the warranty, but because the screen does not work, would they be able to tell that it is unlocked? (HowTos)