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Originally Posted by mrmazda
It could be the BIOS doesn't like to play nice with your display. Is there a motherboard BIOS upgrade available?
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On completing this new build - the motherboard was upgraded by using a Ryzen 3000 so the mobo would initially come on. And then installing an upgrade via usb. After that the mobo would come on when the new Ryzen 5000 was installed.
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Is fast boot enabled in BIOS?
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I haven't checked that yet.
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How old is your display? Older ones well may have electrolytic capacitors fading out of specification prematurely.
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I think this might be the problem.
I'm using my 32" TV as the monitor. It's about 10 years old.
When I press 'restart' the OS shutsdown but the TV display is still running. So the motherboard and grub flashscreens can't be seen.
But if I switch off the plug socket which shutsdown the display (whilst the OS is already off) - then the motherboard and grub screens can be seen on boot.
I tested this further by pressing 'restart' when the OS was on and then turned the TV off and on again via the remote. It was slower to do this than the OS - so I was only able to see the grub screen.
So this means it's a hardware issue. My TV software needs upgrading. But the last software upgrade for my model was in 2012. So I'm not sure that helps.
Incidentally the 'suspend' button now works fine. It may have been the fact that I inadvertently moved the keyboard or mouse which would restart the OS.