No bootable device found after systems board and CPU/memory upgrade

Question

No bootable device found after systems board and CPU/memory upgrade

Anonymous

After finding that the CPU fan had failed was the reason for several problems with my Windows 10 desktop I replaced the system board (Gigabyte GA-Z87-D3HP) and CPU (i7-4770), together with new DDR4 ram, and for good measure, a new power supply. I retained the original CD/DVD drives, SSD and 3 HDD but removed an ageing GPU card (GeForce GTX-650) as I considered the onboard graphics in the new hardware would be more than adequate for my needs . The new motherboard is a GIGABYTE Z690 UD DDR4 and the CPU an i7 12700K.

The original system was password protected which may have some influence on the problem I now encounter...as could the removal of the GPU.

The system starts happily but is unable to find any bootable devices..so I end up with the BIOS screens and a message under the BOOT SEQUENCE that points to Windows Boot Manager, which when highlighted shows the "No Bootable Devices Found".

I have been able to use a Windows 10 installation DVD to access the command prompt and confirm that all the installed drives are recognised, but am unable to set up a boot sequence to set the boot drive as "C" - which is the SSD. I have also confirmed that this SSD contains the System Reserved partition.

Looking around on the internet I see several mentions that I need to disable Secure Boot and enable CSM support,which I have tried to do several times, saving the new settings as I go. I am able to disable secure boot but after several tries I am still unable to enable CSM which I am hoping would resolve the problem of the missing bootable device. However, I* am now wondering if the fact I had a password restricting access to the PC is now preventing me from making the changes I need.

I noticed a post that discusses how to reinstall Windows without loosing Data or Programs, which may be the way to go, but any suggestions or confirmation as to what I might do next would be most appreciated.

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10 answers

Answer 1

Hi,

From what I can find in the manual for the MB you mentioned, the settings you need are in Section 2-5 "Bios Features" Tab of the Bios, and specifically page 49...

You would need to set the CSM On or Off.. You would want it On (Enabled) as seems to be the Default.. This allows using either Legacy or UEFI depending upon how the Windows drive is Initialized as MBR or GPT..

Boot Mode Selection... UEFI and Legacy Allows booting from operating systems that support legacy option ROM or UEFI option

ROM. (Default)

Depending upon your selection you would either select WindowsBootManager or the partition containing the installation as the boot device.

Your new MB appears to be about the same but mentions this... Which would mean that Secure Boot is only available with UEFI Only settings.. The new MB seems to be missing the "Boot Mode Selection"..

Secure Boot

Allows you to enable or disable Secure Boot and configure related settings. This item is configurable only

when CSM Support is set to Disabled.

BTW... I found that the Bios Settings are only available in a separate manual.. mb_manual_600series-bios_e

Answer 2

Anonymous

Have now tried disconnect all but boot drive - still no detection, so am going to second suggestion. Thanks for you help - I will keep you posted with progress...

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Answer 3

As a start disconnect the power to all internal drives other than the win drive, and remove any externals

Check Gig mobo instructions that you are connecting the primary/win drive to the correct connection

You would then have to enter the bios to ensure the primary drive is detected

If it is not you are going to have to download a bootable disk checking utility from that HD makers site

Answer 4

Hi Slance

Thanks for the comprehensive advice. I am having trouble finding the legacy vv UEFI setting in the BIOS - probably because it has become inapplicable after other setting change. However, once I do find the setting I am almost sure I will find that it is set to legacy. As the SSD (Samsung SSD87) that should be the boot drive was installed around 12 months ago(when I did a full reinstall of Windows10) I imagine that it is GPT and that your suggestion may solve the problem.

I am currently running chkdsk against the SSD to make sure it is healthy - so far found one unindexed file which may also have an impact.

Am also trying to find a schema for Gigabyte's BIOS in the hope that it will indicate where to find the "lost" setting - so far cannot find any detail which would assist.

At least I am I useful learning curve... :)

Answer 5

Hi,

You didn't mention how your new Bios is set as far as being "Legacy" or "UEFI"..

You mentioned a System Reserved partition which sounds like a Legacy drive..

You should also see a EFI partition if this is a UEFI drive..

These drives are not interchangeable as a legacy drive is MBR and a UEFI drive is GPT.. There is a tool to convert MBR to GPT but it is a bit of a risk as to how well it works.. Some people have had good results, and others not..

If you can't get the computer to boot in either Legacy or UEFI you may need to do a clean install.. A repair upgrade that keeps all files and programs can only be done from within Windows..

You would need to boot from installation media and do a clean install which would provide the option to keep all of your files, but not installed programs.. The program files would be retained in a Windows.old folder but would not be usable..

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No bootable device found after systems board and CPU/memory upgrade

10 answers