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Windows 2012R2 not booting

Occasional Visitor

Windows 2012R2 not booting

Hi Experts,

I installed Windows 2012R2 in HP Proliant DL380 Gen9 2 months ago and it works fined until this morning when the server get started, suddenly it didn't boot on the OS.

   Error:  No bootable devices were detected., PLease attach a UEFI bootable device. System will automatically retry the UEFI Boort Order...

I have Smart Array P440ar Controller - 300GB RAID 1 Logical Drive.

i can reinstall the Windows 2012R2 but i want to know why suddenly this happened? Is there any conflict between Windows 2012R2 and HP Proliant DL380 Gen9? Because i am affraid that in the future might happened it again. This server will be used for our DataBase.

Any help is really apprecaited. Thanks in advance.