Reboot and Select Proper Boot Device Error

Myute_

Commendable
Apr 13, 2016
4
0
1,510
My PC started receiving "Reboot and Select Proper Boot Device" on boot this morning. I have 128gb SSD boot drive that has worked fine for the past 2 years with windows 7.
I have tried startup repair (no problems were found), clearing CMOS, unplugging everything and plugging them back in, changing boot order in the BIOS, and switching monitor outputs.

My motherboard has the post code AE and I am receiving an error that says "This version of System Recovery is not compatible with the version of Windows you are trying to repair. Try using a recovery disc that is compatible with this version of Windows" when using System Recovery from a Windows 7 Installation Disc.

System Specs:
CPU: AMD FX 8320
Motherboard: Asus ROG Crosshair V Formula Z
PSU: Corsair 850 Watt Gold PSU
Video Card: EVGA GTX 980
RAM: 12 GB
Storage: 128 GB SSD (this is where OS and drivers are)
1 TB HDD (disconnected for troubleshooting)
1 500 GB HDD (disconnected for troubleshooting)

Thanks in Advance.

UPDATE: I changed the boot order for the disc and the ssd and that fixed the "This Version of System Recovery Options in not compatible" issue, but I am still unable to fix the "select a proper boot device" issue.

I have tried to make the boot disk's partition with the Windows Installation active through the command prompt but keep receiving "The selected disk is not a fixed MBR disk. The ACTIVE command can only be used on fixed MBR disks.
I can see the windows files and other drivers when I load drivers through the System Recovery Options.
 
Solution
The UEFI firmware supports two boot modes: UEFI Boot Mode and Legacy BIOS Boot Mode.

In UEFI Boot Mode, the UEFI firmware scan your computer's hard disks for existence of the EFI System partition, then run \efi\boot\bootx64.efi file in the EFI System partition.

UEFI Boot Mode do not use boot sectors on the hard drive (and the USB flash drive) and do not require active partition to be set.

your bios appears to be in the wrong mode.

Colif

Win 11 Master
Moderator
The UEFI firmware supports two boot modes: UEFI Boot Mode and Legacy BIOS Boot Mode.

In UEFI Boot Mode, the UEFI firmware scan your computer's hard disks for existence of the EFI System partition, then run \efi\boot\bootx64.efi file in the EFI System partition.

UEFI Boot Mode do not use boot sectors on the hard drive (and the USB flash drive) and do not require active partition to be set.

your bios appears to be in the wrong mode.
 
Solution

Myute_

Commendable
Apr 13, 2016
4
0
1,510


How would I run \efi\boot\bootx64.efi?
Sorry I haven't messed around in the bios before.
 

Colif

Win 11 Master
Moderator
You don't, the bios does it. that is just explaining what the uefi firmware does at boot. Its not telling you to do it. That is auto.


It is why you don't need an active partition on your drive ( and why you don't have one as well), the bios looks at any hdd on the computer and looks for that file name to boot up

So you need to swap to UEFI Boot Mode to boot since your hdd has no MBR, I have to assume its formatted as GPT which don't have a MBR. Your hdd is formatted for UEFI boot, its just odd this happened now. as this should have happened when windows was installed...
 

Myute_

Commendable
Apr 13, 2016
4
0
1,510


How do I switch to UEFI boot mode?
 

Colif

Win 11 Master
Moderator
Asus web site is so slow. I don't actually know that one vital step

looking in the manual it seems you need to find something called CSM. It should be set to auto (it shows the settings on page 6).

There is a chance you cannot change this now anyway (see here: https://rog.asus.com/forum/showthread.php?49587-Crosshair-V-Formula-Z-UEFI-Boot-help-with-WIn-7)

this is wandering into territory I am not sure of too.
 

Myute_

Commendable
Apr 13, 2016
4
0
1,510


Thanks for your help I finally got it to work without losing any data.