Is a SSD format necessary if the motherboard is dead?

I assume your OS is on the SSD and your data is on the HDD, so there won't be a need to format the HDD, but only the SSD by reinstalling the OS on it. In any case, in principle, even in safe mode, Windows should not start up to allow you to recover your data.

Ok, but I still wanted to retrieve some data from my SSD. I’ll see if I can’t set the SSD as a slave on an old PC so I can recover what I need through the primary hard drive, and then it will be all set for a format. Thanks for the info, anyway.

There remains the complex solution of going through Linux, as indicated by Antipolis below. I haven't tried it yet.

"Motherboard replacement = Windows reinstallation mandatory."

If you're talking about branded PCs, that's true. Otherwise, when replacing a motherboard with the same one, there is no obligation to reinstall. It is true that sometimes things don't go as expected: after replacing the motherboard with a different one, Windows might fail to start even where it should. Generally speaking, if you replace the motherboard with an identical one, or even one managed by the same chipset, reinstallation is not mandatory.

"If you're talking about branded PCs, that's true."
"Pre-built PCs" or "custom PCs" are from the same boat.
Different motherboard and/or processor, it ends up with a nice blue screen or a hyper-unstable PC.

"Otherwise, replacing a motherboard with the same one doesn't require a reinstall."
It's not a question of obligation.
Simply put, it works
.

"A "builder PC" or a "custom PC" is the same."

But no! There are certainly things you can do on a custom PC that you can't do on a branded PC. For starters, a branded PC will inevitably have an OEM version of Windows. Those who have the means can have a custom PC with a retail version of the OS.

"Different motherboard and/or processor, it ends with a nice blue screen or a super unstable PC."

Assuming he took a compatible motherboard and CPU (chipset of the motherboard compatible with the CPU, updated BIOS), there’s no reason there should be a blue screen. Unless one of the components is defective, at least.

"It's not a matter of obligation.
Simply put, it works."

But no, that is not the case in every instance. There are exceptions that I have pointed out.

Hello

On Windows 7 or 8, it's not usually a problem, except on a branded PC. The blue screens were an issue with XP.
As a precaution, you should boot in safe mode and uninstall the drivers of the old motherboard.
However, most of the time you need to reactivate the Windows license.

"And I'll say one thing, if you're changing the motherboard, it's better to take the opportunity to format your hard drive, not only does it encourage us to do some cleaning, but it also means we start with something cleaner".

A hard drive that doesn’t contain the OS can be formatted anytime using Windows. The problem arises with the hard drive where Windows is installed. After changing the motherboard, either Windows boots up or it doesn't. If it doesn't boot, we are forced to reinstall Windows, thus formatting it. Otherwise, you'll end up with two versions of Windows on your PC: one that works and the other that doesn’t. As for formatting just to have a "clean" hard drive, that's a personal choice. It's not mandatory. You can do it even if you're not changing the motherboard to make your system faster because, over time, every PC slows down to some extent.

Are you telling me that there’s a chance to boot Windows from my SSD on my new motherboard without formatting it? I thought this was only possible with two identical motherboards or ones with the same chipset.

You can, but you should back up your personal data first just in case.
Read what epango and I wrote earlier.

Thank you for everything in any case.