Windows 10: Asks to select Boot Device each time I start my laptop

I have Asus Vivobook 15 X505ZA with Windows 10 OS.I upgraded to Windows 10 21H1 recently. There was no problem for someday. But one day I restarted my PC and after that restart, I need to select Boot device each time I start my PC but there is only one Boot device. I don't know what is the exact problem. Everything seems good in BIOS settings. I get this screen each time I start my laptop.

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confused about selecting boot device


This is good information but I am confused about step 2 below. Wouldn't I need to select whatever device, USB or DVD, the install media is on at this point and not how I want the final install to boot?
Thanks,and sorry for dragging up an old post but it had most of the info I was looking for.

It is up to you whether you want to install Windows using MBR or GPT and you need to set the option in the BIOS for MBR or GPT style installation.

Having said that. Here's the steps:

1. Disconnect all HD/SSD except the one you will be installing Windows
2. From the boot menu, Select #1 for GPT or select #2 for MBR to boot up the Windows Installation
   Attachment 29081
   NOTE: The screen is an example and might look different from yours
3. Once the Windows Installation started. On the first screen, Press and hold SHIFT Key + F10, a command Windows will popup then type:
   - diskpart
   - select disk 0
   - Clean
   - Exit
   - Exit
4. Click Next to continue.
5. Select Custom
6. Select the first unallocated partition and click next. Windows will create all needed partitions to install Windows 10
7. Follow all the rest of the instruction to complete.

MBR installation:

1. 500MB System Reserved partition
2. C: Drive

GPT installation:

1. 450MB recovery partition
2. 100MB EFI System Partition
3. 16MB MSR partition
4. C drive.

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reboot and select property boot device

You need to set your main Harddrive which has your Operating System on as the first harddrive to boot, if have more than one harddrive.

open Bios
boot priority
Select the OS harddrive as first boot drive , If not sure switch between them
Set correct time and date if wrong
Save and reboot

If not sure on steps , give the Make and model number of motherboard and can assist you.

Hopefully no damage to the HDD

 

laptop doesnt boot automatically

This is what happened.

1. Did a repair install and later disabled hibertnate in CMD.
2. Enabled legacy option ROM in BIOS.
3. After a few times startup ( i used the system in such mode for 5 days), changed boot option back to default.
4. Vola!! It boots automatically to win10 without any keypress. Tested it with many starts to confirm the same.
5. Re-enabled hibernate option using CMD and later selected Fast Startup.
6. System booted normally, without the need for any keypress.

I do not know exactly whether such steps resolved the problem or what else happened, hence cannot suggest above steps.

Many thanks to all members who helped to troubleshoot problems.