Galaxy Ace GT-S5830D Screen Completely unresponsive after attempted install

So I was trying to source out a problem mounting sd-ext, and decided to give AmonRa 3.06 Recovery ThunderG a try (I was running CWM 6.0.5.3). The flash failed with an error, and I chose to reboot.

The phone simply doesn't respond. At all. I've pulled the battery, pulled the SD card, pulled the SIM.

I've tried booting to recovery and download mode--I don't get any haptic feedback, nor anything visual on my screen.

Is this...dead? Like, beyond Odin dead? It doesn't come up as a device when plugged in to USB via ADB. I can't get anything out of the screen, and my googling is coming up empty.

Is this a lost cause, or is there something I haven't listed that I could try? Thanks!

Completely Stock Nexus 5 Bootloop

My completely stock Nexus 5 has been stuck on a bootloop for 45 minutes. I've had this phone for 11 months from new.

My phone had the flashlight bug - I had the torch on, the phone went to lockscreen and the torch turned itself off, then it wouldn't connect to the camera. I restarted my phone and it has been stuck on the rotating Google coloured ball boot animation for 45 minutes.

The phone is completely stock, running the latest official version of Lollipop. It isn't rooted.

Holding the power button for 5 seconds reboots it to the GOOGLE screen then the boot animation.

Holding down the power + volume down button gets me to a screen with the following options: START | RESTART BOOTLOADER | RECOVERY MODE | POWER OFF

Choosing recovery mode just shows 'No Command'

I have tried fiddling with and hitting the power button (as suggested from Google searches) and this has not fixed the problem. Charging the phone, having it plugged in, having it not plugged all do not fix the issue.

What can I do?