rpdom wrote: ↑
Sun Jul 28, 2019 5:23 am
All the fault finding info you should need is in the above mentioned sticky post.
For a Pi 4, the first test is to disconnect everything, remove the microSD card and power it up. The red light should come on and stay on. The green one should also light up and flash in a sequence of 4 flashes, then pause for 2-3 seconds, then repeat the flashes again. If that works it is a good indication that the Pi is good.
Unplug the power. Put the card back in the slot. Connect the monitor, keyboard, mouse, etc. and plug the power back in again. Make sure the micro HDMI cable for the screen is plugged into the socket nearest the USB-C Power socket.
That's a start. That and all the rest is in the sticky post.
Can't seem to find a solution based on my scenario:
Everything has been working fine for months. Today I thought it would be fun to try to connect my Pi 4 to a TV, so I took out the headless server MicroSD, and tried to boot from a different MicroSD with a fresh Raspbian install. Couldn't get anything to display on my TV.
Put the headless server MicroSD back in, and reconnected all cables as before.
It starts to boot: green light flashes a couple times, red light turns on, network lights turn on but don't flash. Stuck like this (no green light flashing at all except for a couple times when plugging in the power).
- New MicroSD with headless install (same results as above)
- Unplugging everything (green light flashes 4 times)
- Recovery of eeprom (boots then green light flashes quickly, as it should)
- New MicroSD with Raspbian Desktop and HDMI to TV (no picture)
- Different power supplies (normally I use the official Raspberry Pi 4 power supply)
Any ideas? Since the eeprom recovery seems to get a good result it makes me think it _can_ read the SD, but since I can't get any HDMI output I don't really know how to troubleshoot further.
Thanks for any help!