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The "Please select boot device" screen that appears when the computer starts is called the Boot Menu. This screen allows you to start the system from the device you want to install an operating system or perform maintenance. It is a critical step, especially for those who want to format or use bootable tools from USB (Linux live, disk test tools, etc.).
What Do We See in the Image?
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1st Floppy Drive: Floppy drive input that is no longer used
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HL-DT-ST DVDRAM GSA-H42N: Your CD/DVD drive
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ST3320820AS: Hard disk (probably the HDD where Windows is installed)
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Generic Flash Disk: Your USB drive
You can make a selection in this menu using the arrow keys. Select the device you want to start with ENTER.
⚙️ When to Enter This Menu?
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When you want to install Windows
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When you want to change the boot device without entering the BIOS
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If the system does not boot from the HDD and only needs to be opened from USB/DVD
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If a Linux Live system or disk test tool will be started
⌨️ Boot Menu Keys by Brand
| Brand | Boot Menu Key |
|---|---|
| ASUS | F8 |
| Acer | F12 |
| Dell | F12 |
| HP | Esc > F9 |
| Lenovo | F12 or Fn + F12 |
| MSI | F11 |
| Gigabyte | F12 |
What Should You Do to Boot from USB Drive?
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Prepare your USB drive correctly (UEFI/MBR compatible with Rufus)
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Plug in the USB drive, then restart the computer
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Press the boot menu key above (usually pressed before the startup logo appears)
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A "Generic Flash Disk" option appears → Select it and press ENTER
❗ Things to Consider
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If the USB is not visible:
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Try a USB 2.0 port instead of a USB 3.0 port
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Enable "USB Boot" and "Legacy Mode" in BIOS settings
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Re-prepare the USB drive in FAT32 format
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If this screen does not appear automatically during boot, you should configure the Boot Priority settings via BIOS
✅ Summary
The Boot Menu screen allows you to start your computer from an alternative device (USB, CD, HDD). This screen plays a critical role in installing Windows, recovering the system, or performing diagnostics. The "Generic Flash Disk" option in the image indicates that a bootable USB drive is plugged in, and booting from USB can be done by selecting this option.