ASR 970 Pro3 black screen on reboot

I should comment further on amazing results after updating the BIOS.

Apart from fixing my initial problem my PC is like new, extremely fast in booting up and fast at everything, like as if I had a new motherboard. Before everything was sluggish (like me) and I was over time getting used to thinking that this is just how things are.

How would a corrupted BIOS on the MB make such a difference and how would upgrading the BIOS and making it healthy affect the general health of the PC after boot-up?

Really amazing.

That worked like a dream and I feel so dumb. Just went with the UEFI BIOS update and will not bother with the DRAM thing. If it works don't mess with it.
It rebooted twice, once at the end of the Instant Flash process and then again after loading defaults.

To be sure I waited ten minutes for things to settle down and did a restart with fingers crossed and it was perfect.

Who said Santa doesn't come to the bad guys? And thank you wardog for your patience and encouragement. I now have my details in the signature. Great idea.

Hello again, the PC is mid 2014. I had dust bowl problems in north west Australia and humidity problems in Papua New Guinea but this dust here is the worst I have seen, on the coast and it's fine black stuff generated by a supermarket shopping lot across the road. I think I should opt for permanent air conditioning to overcome the problem. In air traffic control the technicians used to tell us the air conditioning was not for our comfort but to protect the equipment.

The PSU is ANTEC SG-850. I think that means 850 watts.

I get a lot of dust but who doesn't. Case needs a hose out at least every three months.

Thanks for the tip wardog.

Replaced the battery and reset to defaults and did have one successful reboot on exit but subsequent reboots not working. Looks like will have to live with resetting the NVIDIA card which is better than nothing. Strange I couldn't find the battery type until I actually saw it after removing the graphics card and it is still fully charged, three years old but changed it anyway.

My heart pacemaker is nearly due for replacement after ten years.

I also obtained a very cheap Logitech keyboard and that also didn't make any difference.