I bought a Raspberry Pi 3 Model B+ from arrow.com but unfortunately I think it is dead. NOOBS was able to install Raspbian once. Raspbian's first-time configuration wizard wanted a reboot and so I let it reboot. It didn't reboot and it has not booted since.
I went through the no boot troubleshooting guide, tried two different verified working microSDHC cards as well as a USB flash drive, and tried NOOBS 2.8.2 and Raspbian Stretch Lite 2018-06-27. My RPi just don't boot. I am using the official power supply and case, and the SD cards are reported as compatible according to https://elinux.org/RPi_SD_cards.
Things I'd tried:
- Removed power and let the RPi rest.
- Verified the downloaded ZIP files.
- Overwrite formatted SD cards with SD Formatter & extracted NOOBS to the root folder with WinRAR.
- Directly flashed Raspbian Stetch Lite with Etcher on to the SD cards.
- Flashed Raspbian Stetch Lite with Etcher on an USB flash drive to let RPi 3B+ boot from USB.
Nothing I tried worked. The Power LED is lit, the Activity LED is dimmed, and the monitor reported no HDMI signal. Full detail of what I tried.
The troubleshooting guide said,
What to do to make sure your PI is defective, if you suspect it is?
If you have a PI B, B+ or 2B, There is just one way! You must have an identical model that does boot, and only when you exchange just the working and non-working PI's, and leave everything else the same, including sd-card, power supply, USB devices, and cables, -everything-, you do that, and then the "bad" PI still won't boot, then and only then you know it is the PI itself.
Is there any RPi Expert in Sydney willing to lend a hand? I am out of ideas.
You say you extracted NOOBS to the root folder of the SD card. You should be extracting the IMG file from the NOOBS ZIP file to your Windows directory and then using Etcher to write the IMG file to the SD card. Similarly for Raspbian Stretch. You extract the IMG file from the ZIP then write the IMG file to the SD card.
It isn't necessary to format the SD card beforehand because writing the IMG raw onto the card with Etcher will create a card with a filesystem on it. That's what an IMG file, it's an image of a disk filesystem. You could plug the card into a PC and you should see partitions on it.
Please clarify this point, but if you have done it by the book, it sounds like a broken RPi if you don't get any HDMI signal.