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Windows 7: Acer UEFI mode will not resume Hibernation

08 Apr 2015   #1

Windows 7 Ultimate x64
Acer UEFI mode will not resume Hibernation

I recently replaced my computers hard drive due to the old one failing. I decided to try and use GPT on the new disk because I want to use more than 4 partitions, unfortunately however, the old BIOS did not support UEFI booting. After much research, I discovered that it is able to boot in UEFI mode with an unlocked BIOS, so I flashed the modified BIOS and was able to set it to boot in UEFI mode. Windows installed without problems and everything is working fine, apart from one thing.

When putting the computer into Hibernation, it will display the error message "No boot device found - Please insert boot media and press any key" when attempting to wake it. Restarting the computer will make it boot and resume successfully, however.

I assume that this is a problem with the BIOS not booting EFI devices first when bringing the computer out of Hibernation.

Is this problem fixable? Should I perhaps stick with MBR in case more problems arise down the line?

PS. Sorry for my bad English, it is a second language.

My System SpecsSystem Spec
09 Apr 2015   #2


How do you know you installed UEFI, although I doubt it has anything to do with this issue? Did you boot the installer as a UEFI device, then delete all partitions to clear the formatting, watch it create an EFI System partition?

Is Windows Boot Manager set first device to boot in BIOS setup? Make sure now.

Can we see a screenshot of Disk Management - Post a Screen Capture Image ?

Work through the steps given here for most Sleep Mode Problems - Vista Forums .
My System SpecsSystem Spec
09 Apr 2015   #3

Windows 7 Ultimate x64

I do not believe I have installed UEFI, I believe that the current BIOS was able to boot from EFI devices, however the option to do so was not in the BIOS until I flashed the unlocked one.

The two options I changed after the BIOS flash were:

"Boot in UEFI mode: TRUE"
"Boot from EFI devices first: TRUE"

The installer was booted as a UEFI device and Windows created the required partitions fine.

The Hard Drive was new, so it was not partitioned until I created one in the installer.

Attached is a screenshot of Windows Disk Management, and one from Partition wizard. Partition wizard shows a partition that Windows Disk Management does not.

Maybe I am misunderstanding, but I do not think you can set Windows Boot Manager as first device in the BIOS? The Hard Drive is set as first device.

I read through "sleep mode problems - vista forums", but unfortunately nothing helped.

Thank you for your help.

Attached Thumbnails
Acer UEFI mode will not resume Hibernation-disk-management.png   Acer UEFI mode will not resume Hibernation-partition-wizard.png  
My System SpecsSystem Spec

09 Apr 2015   #4


That partition is hidden in Disk Mgmt.

You have an EFI install, for which Windows Boot Manager is normally set first to boot and not HDD.
My System SpecsSystem Spec
09 Apr 2015   #5

Windows 7 Ultimate x64

Ah, I understand. You were correct, after checking through the BIOS again, there was an option to set "Windows Boot Manager" as first device and once that was set, Hibernation mode worked.

Thank you for your assistance!
My System SpecsSystem Spec
09 Apr 2015   #6


Surprised it started. But then every UEFI BIOS is different.

My System SpecsSystem Spec

 Acer UEFI mode will not resume Hibernation

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