Rockpro64 doesn't boot

[dukla2000]

Are there any checksums available for the download images?

Sadly no. But unlikely that is the problem.

I would suggest plugging away with the simplest setup you can, which means stick to bionic minimal until you get some progress.

I have never used etcher, but have flashed images (for multiple Arm SBCs starting with an original Pi) just fine with dd. Whether you start with an SD created by etcher, or do it manually as per steps 1-4 here, I would spend plenty of time on step 4 with the SDcard in your Pi.

lsblk should show it has 7 partitions - if not do steps 1-3 properly! You should be able to fsck especially p6 (a DOS partition) and p7 (the rootfs). You can even mount them, browse about and get some confidence that the card looks like it should work.

For step 5 I would go with just monitor and keyboard (mouse and network not necessary yet so eliminate from argument). RP64 should boot a couple of secs after power applied - when power applied green light on immediately, white LED should come on after 3-5 seconds once the OS load starts from the SDcard. Within 30 secs you should have had plenty of excitement on your screen, from what you say you have been here several times before without any excitement on your screen!

You can try a press on the reset button or to try the power button. It is hard to know if the power button is doing much on an unresponsive system, the low level indicator is probably just the lights on the RJ45 socket - it you are getting this desperate can always try plug the cable in and watching the light on your router as well! Last attempt to try elicit some response from your RP64 would be to try OTG mode. This is only a diagnostic to see if there is any life in there - I would guess if you do try this you can assume you do not have a bootable image and so I wouldn't expect any RP64 lights, only a new USB device on the other end of a cable plugged into the USB-C port of your RP64.

Otherwise I fear it has gone to meet its maker. Yeah a serial console may help, but my 6p says the pain of trying to work out how to setup/use it on a possibly dead board is vastly not worth the gain. Similarly you would need an eMMC and USB dongle to load it to bypass the SDcard socket a a point of failure. If you can get into OTG mode this becomes more relevant.

Good luck