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First I replaced my h81 mb to a Z97 deluxe to be able to OC my i7 4790 
After I replaced and everything went smoothly I have noticed to an issue , when I start my machine it says that "operating system wasn't found".
After it I thought it's because I swtiched mb and I didn't really care to format cause I didn't have a lot of thing on my PC.
After it I have noticed to another issue , my PC recognizes one of my two hdds but doesn't let me use it so , I created a new partition and it worked , now I restarted my PC and it says again that "operating system wasn't found" please help me what to do, I tried to unplug one of the drives to start from my second drive but it keeps saying that

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3 minutes ago, ShadoWStars said:

First I replaced my h81 mb to a Z97 deluxe to be able to OC my i7 4790 
After I replaced and everything went smoothly I have noticed to an issue , when I start my machine it says that "operating system wasn't found".
After it I thought it's because I swtiched mb and I didn't really care to format cause I didn't have a lot of thing on my PC.
After it I have noticed to another issue , my PC recognizes one of my two hdds but doesn't let me use it so , I created a new partition and it worked , now I restarted my PC and it says again that "operating system wasn't found" please help me what to do, I tried to unplug one of the drives to start from my second drive but it keeps saying that

your windows is not compatible with mobo

 

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You should reinstall Windows when doing such a hardware change. 

Main System: Phobos

AMD Ryzen 7 2700 (8C/16T), ASRock B450 Steel Legend, 16GB G.SKILL Aegis DDR4 3000MHz, AMD Radeon RX 570 4GB (XFX), 960GB Crucial M500, 2TB Seagate BarraCuda, Windows 10 Pro for Workstations/macOS Catalina

 

Secondary System: York

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Plug in on your drive with your OS on it. It's booting to the drive with no OS.

 

If you're running Windows 10, the OS will automatically repair itself to remove drivers that will stop it from entering the OS.

 

If you're running Windows 7, there is a guide in my signature on how to do the repair with a piece of software (it's provided)

X-10 - 7980XE - Gigabyte Aorous Gaming 9 - 128GB GSkill TridentZ RGB - SLI Asus GTX 1080 TI Strix
Easy Desk GuideMalware Removal Guide - New mobo, Same OS Guide

 

 

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44 minutes ago, Jamiec1130 said:

You should reinstall Windows when doing such a hardware change. 

I did reinstall windows read again

42 minutes ago, ttam said:

Plug in on your drive with your OS on it. It's booting to the drive with no OS.

 

If you're running Windows 10, the OS will automatically repair itself to remove drivers that will stop it from entering the OS.

 

If you're running Windows 7, there is a guide in my signature on how to do the repair with a piece of software (it's provided)

I didn't really understand

59 minutes ago, Necrodor21 said:

our your primary hdd is not you choose already

What? 

59 minutes ago, Necrodor21 said:

your windows is not compatible with mobo

 

It doesn't make sense

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In your BIOS do you have the correct drive selected for booting to?? Make sure there first. Now unplug ALL drives other then the drive you are installing windows to. Install windows first and then once everything is up and running, then you can plug in all other drives. 

 Current System: MoonLightRyzen

CPU: Ryzen 7 1700x @ 3.9ghz  Board: Asus ROG C6H  Ram: G.Skill TridentZ 32gb 3000mhz  Case: Lian Li PC-O11 Dynamic

GPU: Asus ROG Strix GTX 1070 OC in SLI M.2: Samsung 960 Evo 250gb SSD: Samsung 850 Pro 512gb x2 HDD: Seagate Barracuda 3TB and 2TB

PSU: Corsair RM850x White  Cooler: XSPC/Phanteks Custom Loop 

Backup System: RedDragonV3.0

FX-8350 @ 4.7ghz, Asus TUF Sabertooth 990fx r3.0, MSI GTX 1060 6gb Gaming X, Crucial Balistix Tracer 32gb, M.2 Samsung 960 Evo 250,

Seagate Firecudda 2tb, Seagate Barracuda 2tb, NZXT S340 Elite White, Kraken X62, Corsair RM750x, Hue+

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8 minutes ago, Santo22 said:

In your BIOS do you have the correct drive selected for booting to?? Make sure there first. Now unplug ALL drives other then the drive you are installing windows to. Install windows first and then once everything is up and running, then you can plug in all other drives. 

I have tried to plug only the one with the one and it doesn't work too

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3 hours ago, ShadoWStars said:

What?

=

3 hours ago, Santo22 said:

In your BIOS do you have the correct drive selected for booting to?? Make sure there first. Now unplug ALL drives other then the drive you are installing windows to. Install windows first and then once everything is up and running, then you can plug in all other drives. 

 

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What drive is set to boot in BIOS? I Don't think you have answered this yet

 Current System: MoonLightRyzen

CPU: Ryzen 7 1700x @ 3.9ghz  Board: Asus ROG C6H  Ram: G.Skill TridentZ 32gb 3000mhz  Case: Lian Li PC-O11 Dynamic

GPU: Asus ROG Strix GTX 1070 OC in SLI M.2: Samsung 960 Evo 250gb SSD: Samsung 850 Pro 512gb x2 HDD: Seagate Barracuda 3TB and 2TB

PSU: Corsair RM850x White  Cooler: XSPC/Phanteks Custom Loop 

Backup System: RedDragonV3.0

FX-8350 @ 4.7ghz, Asus TUF Sabertooth 990fx r3.0, MSI GTX 1060 6gb Gaming X, Crucial Balistix Tracer 32gb, M.2 Samsung 960 Evo 250,

Seagate Firecudda 2tb, Seagate Barracuda 2tb, NZXT S340 Elite White, Kraken X62, Corsair RM750x, Hue+

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4 hours ago, Necrodor21 said:

check your sata cable or sata power

It's connected well

 

4 hours ago, Santo22 said:
4 hours ago, Santo22 said:

What drive is set to boot in BIOS? I Don't think you have answered this yet

It boots up to windows properly but it doesn't show me the HDD so it doesn't matter

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OH so it is booting into windows, it's just not picking up your second hdd? 

 Current System: MoonLightRyzen

CPU: Ryzen 7 1700x @ 3.9ghz  Board: Asus ROG C6H  Ram: G.Skill TridentZ 32gb 3000mhz  Case: Lian Li PC-O11 Dynamic

GPU: Asus ROG Strix GTX 1070 OC in SLI M.2: Samsung 960 Evo 250gb SSD: Samsung 850 Pro 512gb x2 HDD: Seagate Barracuda 3TB and 2TB

PSU: Corsair RM850x White  Cooler: XSPC/Phanteks Custom Loop 

Backup System: RedDragonV3.0

FX-8350 @ 4.7ghz, Asus TUF Sabertooth 990fx r3.0, MSI GTX 1060 6gb Gaming X, Crucial Balistix Tracer 32gb, M.2 Samsung 960 Evo 250,

Seagate Firecudda 2tb, Seagate Barracuda 2tb, NZXT S340 Elite White, Kraken X62, Corsair RM750x, Hue+

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