@jjconstr regarding the boot loop, the N5 is really hard to break. Chances are it will boot with the installer. That's why we love the N5 so much around here, it's very difficult to brick. So, if it's in a boot loop, it's most likely that way because someone flashed a wrong file or borked the partitions.
The power button can eventually poop out, which gives you a boot loop. I have two N5's down, have two replacement buttons, but it's a pretty tedious repair, so haven't made the time to buckle down and attempt it.