Unable to Boot Windows in UEFI

[piselloa]

I recently deployed Windows Server 2008R2 on a HP DL380 Gen9 using HP ICSP.

In order to get the server to successfully connect to our PXE appliance i had to disable the onboard 1gb connections, and boot in Legacy BIOS. After a successful deployment i changed the server back to UEFI, however now it wont boot into Windows. 

When i try to do a one-time boot with UEFI enabled the Windows Bootloader can be seen. But when selected it just loops me back to the one-time boot menu. And if i let the server boot without interruption it just loops saying there are no bootable devices attached. 

When i set the server back to Legacy BIOS it boots into Windows without issues.

Any suggestions?

[Torsten.]

Legacy and UEFI loaders are different, so what you see is normal.

You could try to use windows repair option by booting an install media.

[Jimmy Vance]

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@piselloa wrote:

I recently deployed Windows Server 2008R2 on a HP DL380 Gen9 using HP ICSP.

In order to get the server to successfully connect to our PXE appliance i had to disable the onboard 1gb connections, and boot in Legacy BIOS. After a successful deployment i changed the server back to UEFI, however now it wont boot into Windows. 

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UEFI can PXE boot, but you need to make some tweaks to your DHCP/PXE configuration.  I haven't done it with Windows, but I've written papers on the changes required for UEFI PXE for Linux

[Cederberg]

Hi.

I don't know about the PXE stuff but the reason for windows 2008 r2 not booting in UEFI mode is the BIOS option UEFI Optimized Boot is probably enabled. To use windows 2008 r2 in UEFI mode on a Gen9 server with UEFI mode enabled you need to disable UEFI Optimized boot.

UEFI Requirements

http://h17007.www1.hp.com/docs/iss/shared/gs/192456.htm

How to disable UEFI Optimized boot

http://h17007.www1.hp.com/docs/iss/proliant_uefi/s_UEFI_opt_boot.html

[netmen2000]

HP UEFI Deployment Guide for HP ProLiant Gen9 Servers:

http://h20565.www2.hpe.com/hpsc/doc/public/display?sp4ts.oid=7829634&docId=emr_na-c04565930&docLocale=en_US