Doh! Forgot to enable AHCI when installing an OS AGAIN!

Streeteh

Streeteh

Streeteh

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As you can see from the title, this happens to me often. In fact i've never successfully got AHCI working on any of my computers as i always forget to enable it in BIOS before i install a fresh OS. Now, i've followed that guide in the windows support section where you modify the registry but it still doesn't boot; I get a message saying 'BOOTMGR is missing'.

What on earth am i doing wrong? I've followed the windows guide to the letter and every result on google is just people linking to the windows guide followed by the guy having the problem relying 'Oh wow! It worked, awesome, only an idiot wouldn't be able to fix it with that guide at his fingertips!'.

Feeling rather silly right now, any help would be greatly appreciated.
 
Is your mother board losing its settings?
because once you set AHCI it should not turn off untill you do so in the bios.

I know Vista can be AHCI enabled in the reg but you can't on XP

I did have 'BOOTMGR is missing' once and all that was is it was booting off the wrong HD
And in the real world AHCI is only good for e-sata.

what os you running?
 
Running windows 7. I want AHCI running as i do have a esata drive, from what i've read it does also bring some other minor benefits too, but its mainly for the hotswapping.

I don't really know how to tell if the mobo is 'losing its settings'. The boot priority remains as i set it and all four of my sata drives are still detected.
 
Is this the way you have tried so far

Open Regedit the go to
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es\Msahci

In the right pane, right-click Start in the Name column, and then click Modify
In the Value data box, type 0, and then click OK
On the File menu, click Exit to close Registry Editor

restart and make sure its anabled in the bios.
 
Tis a strange one indeed, after googling for nearly an hour today i haven't found a single person who has the same problem as me. I've read the AHCI section in my mobo manual several times and it just says i can enable or disable AHCI there, but doesn't mention any problems that might occur by doing so.

Basically i'm stumped.
 
Streeteh said:
Tis a strange one indeed, after googling for nearly an hour today i haven't found a single person who has the same problem as me. I've read the AHCI section in my mobo manual several times and it just says i can enable or disable AHCI there, but doesn't mention any problems that might occur by doing so.

Basically i'm stumped.
Click to expand...

This is what happenes when you follow the book like acedemics. :rolleyes:

I say just go for the fresh format again if you really want it activated that badly.
 
optitech-uk said:
This is what happenes when you follow the book like acedemics. :rolleyes:
Click to expand...

What am i supposed to do? Pray to the gods of the internet? Become the maverick of BIOS settings? 'I may not do things by the books, but by god i get results!'. I don't exactly think it's a bad thing to refer to the instruction manual when you're well and truly stumped on something.

I will reinstall windows if no one else is able to give any solutions.
 
Do you actually hot un-plug your hard drives a lot ( requiring ahci) ?

I tried both on and off , and could see no performance benefit from it on ( tho
I dont run a server on my PC , so the ncq was a none issue)
 
wombraider said:
Do you actually hot un-plug your hard drives a lot ( requiring ahci) ?

I tried both on and off , and could see no performance benefit from it on ( tho
I dont run a server on my PC , so the ncq was a none issue)
Click to expand...

As i say i've got a e-sata harddrive (well it's actually that icybox dock where the drive slots into a front drive bay) that i switch between my PC and my PS3 quite often. I'm in no rush to get it working but i will probably reinstall windows if no solution can be found in the next week or two.
 
Streeteh said:
What am i supposed to do? Pray to the gods of the internet? Become the maverick of BIOS settings? 'I may not do things by the books, but by god i get results!'. I don't exactly think it's a bad thing to refer to the instruction manual when you're well and truly stumped on something.

I will reinstall windows if no one else is able to give any solutions.
Click to expand...

No no no no don't bite at me please. I never ment it like the way you took it. I ment it as in lately people at our workplace have no experience but they have qualifications and they say to me it's best to follow out the book. In your scenario your having trouble following the book. Ignore me I just laughed when I saw the post about reading from the book brings me back memories of people at my workplace trying to be all god like cos they have degrees no experience.

Streeteh said:
As i say i've got a e-sata harddrive (well it's actually that icybox dock where the drive slots into a front drive bay) that i switch between my PC and my PS3 quite often. I'm in no rush to get it working but i will probably reinstall windows if no solution can be found in the next week or two.
Click to expand...

Format anyway, might be best of this way and probably faster.
 
optitech-uk said:
No no no no don't bite at me please. I never ment it like the way you took it. I ment it as in lately people at our workplace have no experience but they have qualifications and they say to me it's best to follow out the book. In your scenario your having trouble following the book. Ignore me I just laughed when I saw the post about reading from the book brings me back memories of people at my workplace trying to be all god like cos they have degrees no experience.
Click to expand...

Ah sorry, having a grouchy morning it seems.
 
What mobo do you have?

If you have another pair of SATA sockets which aren't the Intel ICHxx(R) then set the other controller to IDE mode, move the boot drive onto that controller, reboot and see if the system will boot. If it does then set the Intel controller to ACHI mode within the BIOS and reboot, when prompted install the ACHI drivers and reboot to make sure the systems fine. Then move the boot drive onto the Intel and it should hopefully boot up.

The above is what I did on my old Gigabyte mobo when I too had forgotten to enable ACHI when doing an install.
 
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