No boot device recognised after CPU and Motherboard upgrade

[Genesius]

No boot device recognised after CPU and Motherboard upgrade

Hi all.
I’ve changed from an Intel G4560 and AsRock board to a new 12th gen i3 12100 and an ASUS H610M-K D4.

It a new office pc. I popped the SSD from the old system into the new and there was no boot device but the drives were recognised.

A bit of searching and the boot drive is formatted to MBR not GPT. So I used Easeus to change to GPT.

Still no joy.

Then I read I need CSM enabled but that option was greyed out.

I read I need to add a graphics card. So I put in a Gigabyte 960 oc that I have and I was able to selected the CSM option and change from disabled to enabled ‘save and reset) but then I still have no boot device and the option resets to disabled.

It’s really frustrating. Is there a way to make this work or do I have to do a clean windows install?

Thank you

 

[Mr Mcgoo]

A clean install would be easier but before you do that you need to make sure you have you hdd/ssd set to ahci. If that dont work, you will need to enable legacy support. Under csm you should see uefi or legacy. Your old set up may have been installed with csm enabled with legacy support.

 

[lsg1r]

Just a random thing, have you checked the boot order?

 

[Genesius]

A clean install would be easier but before you do that you need to make sure you have you hdd/ssd set to ahci. If that dont work, you will need to enable legacy support. Under csm you should see uefi or legacy. Your old set up may have been installed with csm enabled with legacy support.

The option is greyed out until I add a GPU and then it won’t stay active after a restart. The old system died hence the new one.

 

[Genesius]

Just a random thing, have you checked the boot order?

There is no boot order because it sees the drives but doesn’t recognise them as boot devices. I’ve changed from MBR to GPT so I thought it should work. But it didn’t.
So look like I’ll be installing windows 11 and everything else. It’s a real pain