Solved What's different?

As I've explained many times, I'm a hobbyist and experimenter, when it comes to various OS's, of the Windows variety.
I have only a limited number of PC's to play with, and most are ten years old, or more.

Recently I've acquired a copy of Windows 11/Pro/64, 24H2 and installed it onto an SSD on one of my older PC's. It installed just fine, without ever a whimper. But then when I tried to reboot that PC, nothing happened. I got no error messages, no sparks or smoke, it just did not boot.

I pulled that SSD out and installed it into one of my newer PC's and it booted up just fine, and ran just fine.

So, I'm just wondering, what 24H2 could be looking for during the boot up process that it's not finding in the older PC's.?

On the PC's that can't or won't run 24H2, they run 23H2 just fine, as well as all earlier versions of Windows 11.

So, it's a big mystery. Any ideas?

TM

Where did the copy of Windows 24h2 come from? I am always weary of anything from outside of Microsoft.
24H2 belongs to an Insider build, you knew that though right?

TechnoMage2021 said:

So, it's a big mystery. Any ideas?

Click to expand...

Short version.... your CPU needs the SSE4.2 Instruction Set...





The Ghacks article from Feb 2024 says SSE4.2 and/or SSE4A.
The April 2024 Ghacks article only mentions SSE4.2

TechnoMage2021 said:

Recently I've acquired a copy of Windows 11/Pro/64, 24H2 and installed it onto an SSD on one of my older PC's. It installed just fine, without ever a whimper. But then when I tried to reboot that PC, nothing happened. I got no error messages, no sparks or smoke, it just did not boot.

Click to expand...

What CPU does it have? 24H2 requires a CPU that has the SSE4.2 instruction set. It cannot boot on a CPU that doesn't have it.

Check your CPU with CPU-Z.

I'm kinda curious if it is indeed an older CPU that is the issue. What I question however is if you're able to install it wouldn't it make sense that it should boot up? During a clean install of Win11 I think the installer will reboot the system like 3 times during the installation process. I would think that "IF" the CPU was the issue wouldn't it fail to reboot during the installation reboots?

Ghot said:

The Ghacks article from Feb 2024 says SSE4.2 and/or SSE4A.
The April 2024 Ghacks article only mentions SSE4.2

Click to expand...

Starting with 24H2 build 26080 SSE4a on its own is no longer sufficient, it now has to have SSE4.2.

Windows 11 24H2 has received yet another hardware requirement for users with modded Windows 11 installs to watch out for. Bob Pony on X (Twitter) discovered that the SSE 4.2 instruction set is now required to run Windows 11 24H2, starting with build 26080. If the instruction is lacking, the OS won't boot.

Click to expand...

BamaInArk said:

I'm kinda curious if it is indeed an older CPU that is the issue. What I question however is if you're able to install it wouldn't it make sense that it should boot up? During a clean install of Win11 I think the installer will reboot the system like 3 times during the installation process. I would think that "IF" the CPU was the issue wouldn't it fail to reboot during the installation reboots?

Click to expand...

The article I linked says this, near the bottom...

Attempting to boot Build 26080+ on systems without the SSE4.2 instruction present will trigger an automatic reboot once it reaches the boot screen phase."

Click to expand...

Build numbers 26080+ are 24H2 builds.


It's not really a big deal though. Computers will run fine on 23H2.

BamaInArk said:

I'm kinda curious if it is indeed an older CPU that is the issue. What I question however is if you're able to install it wouldn't it make sense that it should boot up? During a clean install of Win11 I think the installer will reboot the system like 3 times during the installation process. I would think that "IF" the CPU was the issue wouldn't it fail to reboot during the installation reboots?

Click to expand...

Well, I sort of thought that too, but, the ISO I used does not reboot two or three times. Only once at the end of the install, and that's where the failure comes in.

The answer about the SSE4.2 Instruction is RIGHT ON! Thank you. 24H2 will run just fine here and on my sister system, but not on an older laptop.
Here's my CPUZ readout:


With my somewhat limited computer OS engineering knowledge I sort of thought that the answer would be a simple one, and sure enough it is.

So it comes down to some code inside the CPU itself and not something external to it. And changing that code is not within my expertise.

To answer a previous question from a trusted member, "NO, I did not get the ISO from MS." They add too much BS to the OS for my taste.

And I'm fairly certain, that with this little fault in the 24H2 OS becoming public knowledge, the problem will be fixed.

If not, that's still OK, because I have two Main PC's, with AMD cpu's that will run 24H2 just fine. And, one HP Laptop, that is already running 24H2. It's really no big deal if my older PC's will not.

Thanks for the good help, that I was sure I would get here.

Blessings
TM

PS: I just ran CPU-Z on all my PC's and found all those that do NOT have the SSE4.2 Instruction set. However, they are all running earlier versions of Windows 11.

TechnoMage2021 said:

I'm fairly certain, that with this little fault in the 24H2 OS becoming public knowledge, the problem will be fixed.

Click to expand...

I'm not. This only affects some older unsupported CPUs. All supported devices will have SSE4.2 anyway, so MS have no reason to 'fix' this.

TechnoMage2021 said:

And, one HP Laptop, that is already running 24H2

Click to expand...

Interested in why you would need or even want more than one PC testing an insiders operating system? Unless they’re different versions of insider builds?

Burn that iso to USB using Rufus and remove requirements. See if it boots after installing via that USB.

Yous guys just don't get it!!!
Y'all keep talking about MS like as if I had anything to do with those losers!
I don't and I won't.
And the ONLY intelligent way to put an ISO on a Flash Drive is with Rufus, and I always let Rufus do it's best. It's never failed me!
I've installed Windows 11/Pro/64 over fifty times already, so I'm pretty good at it, and I've never had a problem, till trying to install 24H2 on a 16 year old laptop. That laptop does run Windows 11/Pro/64, 23H2 just fine.
I not only install Windows 11, but I like to tweak it and tune it for Maximum Performance, and to make it as user friendly as possible

When I get a line on some new OS, regardless of where it came from, I like to try it out on as many different PC's as I can.
* I have PC's as much as 16 years old, all running some version of Windows 11.

So if someone writes me and says "can I do this......?" I like to be able to give them the best answer. And I have people from all over the world, asking me questions every day.

Cheers Mates!
TM

TechnoMage2021 said:

Yous guys just don't get it!!!

Click to expand...

Yeah, we do get it, you like bypassing copyright requirements. That’s no secret, you’ve told us many times in so many words. It doesn’t make the questions any less valid.

Bree said:

I'm not. This only affects some older unsupported CPUs. All supported devices will have SSE4.2 anyway, so MS have no reason to 'fix' this.

Click to expand...

Yeah this isn't something that can be fixed by someone outside of microsoft. And I don't see a reason for it to be fixed. Older pc's should be recycled.

TechnoMage2021 said:

Yous guys just don't get it!!!
Y'all keep talking about MS like as if I had anything to do with those losers!

Click to expand...

this is a baffling statement

1) Yes, we get it. I am certain that everyone here has at least a fifth grade level reading comprehension.
2) Had you stated that you had used Rufus, in any fashion, to begin with, I would have never mentioned it.

andrew129260 said:

Older pc's should be recycled.

Click to expand...

What about older people? I would love to be recycled into a 25 year old, but be able keep my wisdom.

TechnoMage2021 said:

Y'all keep talking about MS like as if I had anything to do with those losers!
I don't and I won't.


I've installed Windows 11/Pro/64 over fifty times already, so I'm pretty good at it, and I've never had a problem, till trying to install 24H2 on a 16 year old laptop. That laptop does run Windows 11/Pro/64, 23H2 just fine.
I not only install Windows 11, but I like to tweak it and tune it for Maximum Performance, and to make it as user friendly

Click to expand...

Kinda sounds like you do have a lot of interaction with those losers to me.

Sounds like my simple question has degraded into a piddling contest.

My question was answered, and quite properly.

There is also a 24H2 V2 in the works, and hopefully it will address the problem.

Thank You, for those who answered my original Question.
Now I know where I can install Windows 11/Pro/64, 24H2, and where I can't.
CPU-Z has told me exactly which of my PC's are compatible and which ones are not.

Cheers Mates.
TM
Consider this thread closed

The MageMeister has gone rogue! And why not. Most older PCs will still satisfy the needs and requirements of the average domestic end user. I don't really think that's such a bad thing. Of course, one pays the munny (or not) and takes their chances but is it really so different than jumping on the band wagon of the advertised latest greatest? Is there not risk involved in this also?

TechnoMage, you're an enthusiast in your own right and I applaud you for it. You like to push the envelope and see just what these old girls can do. Sometimes the results can be rather impressive. Sure beats tossing them in recycling bins. I'm with you in this. I just finished giving a completely refurbished Acer to a young lad, disadvantaged in some ways, struggling with autism, single parent family etc. It will never run 24H2 but it still runs an i5 quad core and an AMD 5450 graphics card and that's good enough for his purposes. Just watching his face light up when he 'test drove' the thing was payment enough for me. (Plus it kept another PC out of the dumpster.)

If I have to start using rogue operating systems to keep doing this so be it. Not enough is being done about e-waste IMO and for me this is a great way around the problem. That old Acer probably has at least another 5 years use left in it and it will be put to good use as that lad is also keen on coding. His mom is happy because her printer works again and life goes on.