Trouble getting new SSD to boot into AHCI

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mattalicious93

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Feb 17, 2013
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So i just installed a new samsung 850 EVO 250gb SSD into my system. I clean installed windows 8.1 onto that drive, which went smoothly. I also have a 1tb WD black HDD (that I formatted beforehand) that I want to use for more space. When I plugged this drive in I started getting boot screen errors. This was fixed by selecting the boot device as the samsung SSD, but in IDE mode. If I select it in AHCI mode, I get the boot screen error and cannot boot windows. I've tried safe mode, I've tried changing the two registry values to zeroes, nothing seems to work. I'm sure it's something simple that I'm missing, so I'm hoping someone reading this thread may have had experienced a similar error or just knows a lot more and can help me out. Thank you!

I have an Asrock H61m-HVS board. I believe the boot drive (SSD) is plugged in to SATA_2 and the HDD is plugged into SATA_3.
 
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Ahh...now we're getting somewhere. Sounds like it is working in AHCI mode as it should be.

Windows installed as a UEFI boot record, so it won't read the typical BIOS one that PCs have relied on for many years. Leave that as...
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HillBillyAsian

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Apr 4, 2013
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Usually this happens because you installed windows while it was still in ide mode, instead of ahci. Most mobos tend to switch it to ahci on a prompt before hand, but not all. My advice to make sure it works completely is reinstall windows and make sure its in ahci mode before hand.
 
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mattalicious93

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Feb 17, 2013
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I know this is kind of a dumb question, but how do I make sure it's in AHCI mode when I install windows? Because if that is all it takes to fix the problem, I would happily reinstall windows. I just don't know how to switch it. I'm installing 8.1 from a USB flash drive, as I don't have a windows install disk. I boot to the flash drive and install it that way.
 
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mattalicious93

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Feb 17, 2013
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Yea I've tried this unfortunately with no luck.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\storahci\
turn error value control to 0. The thing is I can't find this StartOverride folder for the other value, but I see the "0" entry under an "enum" folder, where the value is a long string of text and not "3" like it's apparently supposed to be. Which I still changed to 0, but unfortunately did not fix the problem.
 
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dudeman509

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Jan 23, 2015
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Actually, that one registry value looks like all there is for 8 (I'm a 7 user).

Just enable the AHCI setting for both disks in the BIOS, then boot to the flash drive. I'm thinking maybe it's still trying to look at the WD drive for some sort of AHCI flag that Windows is refusing to set.
 
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mattalicious93

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Feb 17, 2013
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I might actually be stupid haha. So what's going on is, when I select the boot device I can boot from either UEFI: Samsung SSD or AHCI PO: Samsung SSD, UEFI booting fine and AHCI AHCI causing the boot screen error. I just assumed this was where you switched it to AHCI, but upon messing around in the bios further I actually found the SATA options in the storage config, and it shows AHCI as the SATA mode. So am I already in AHCI? Haha! If so though, what is this other AHCI boot device that I can't boot into?
 
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dudeman509

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Jan 23, 2015
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Ahh...now we're getting somewhere. Sounds like it is working in AHCI mode as it should be.

Windows installed as a UEFI boot record, so it won't read the typical BIOS one that PCs have relied on for many years. Leave that as UEFI.

https://technet.microsoft.com/en-us/library/hh824898.aspx
 
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sobijam

May 19, 2019
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mattalicious93 said:
So i just installed a new samsung 850 EVO 250gb SSD into my system. I clean installed windows 8.1 onto that drive, which went smoothly. I also have a 1tb WD black HDD (that I formatted beforehand) that I want to use for more space. When I plugged this drive in I started getting boot screen errors. This was fixed by selecting the boot device as the samsung SSD, but in IDE mode. If I select it in AHCI mode, I get the boot screen error and cannot boot windows. I've tried safe mode, I've tried changing the two registry values to zeroes, nothing seems to work. I'm sure it's something simple that I'm missing, so I'm hoping someone reading this thread may have had experienced a similar error or just knows a lot more and can help me out. Thank you!

I have an Asrock H61m-HVS board. I believe the boot drive (SSD) is plugged in to SATA_2 and the HDD is plugged into SATA_3.
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I have the same problem with same baord i also used samsung evo 850 and using 3 other harddrives of seageates of 1 tb ,500 and 250 an also using cd room . All are sata . and my board asrock h61m . When i m trying to use achi mode screen got black during boot. Do u get any Solution ?
 
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