Empty Boot priority order list and No Bootable Device

At first, the priority list had one item in it with no name (it just displayed "1. "). I tried to change my OS and created a bootable USB memory stick, which was identified by other laptop (in Boot priority list). After changing Mode from UEFI to Legacy and back, now nothing is in Acer Predator's boot priority list no matter if Secure Boot is Enabled or Disabled.

When I turn on computer there appears message "No Bootable Device".

I have tried resetting all settings to factory defaults but the problem is still there.

My HDD is identified in BIOS.
I have Linux installed in my machine.

How to fix this problem?

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Commodore_1995#

Can you provide the exact model of the notebook? Example an515-51-75kz. Do ssd and hdd appear in the bios information tab? Does the same problem occur when resetting the battery? W

https://www.youtube.com/watch?v=NfhgnxUJoZo&list=FLVBqwtBw09_Z9tXo1Injakw&index=7&t=0s

Karlos1

@egydiocoelho thanks for your reply. Please see the answers to your questions:

1. Exact model: Acer Predator G3-573
2. Yes, it appears (see the picture below)
3. After resetting the battery the problem occurs again