Check if the Hard drive is detected and the SATA option set to AHCI in the BIOS. The video in the link below might help with the no bootable devices problem by checking BIOS settings such as restoring BIOS settings, change the boot mode (Legacy/UEFI), boot sequence and SATA operation.
Dell Inspiron 3543:
Please check out geto post in the link below, hopefully it will be a help to you as well.
EDIT / Dell Inspiron 13 No bootable device found:
Quick Solution for UEFI base
I'll try to write it in English
Step by step According to the pictures...
Put Name: 123
When the "123" list was added to the list above, the "V" must be removed from the rest
Apply => open popup windows => click "OK"
The system restarting...
Wait and see if my magic has succeeded ...
You check in the BIOS to see if the Hard drive is detected and SATA is set to AHCI ? If no, please check out the images and video I've posted above....
It appears you're missing the windows boot manager in the BIOS. This could means the BIOS settings are off, corrupt windows or even a faulty hard drive.
Hard Drive Not Detected (Official Dell Tech Support)
Troubleshooting Hard Drive (Official Dell Tech Support)
How old is the computer? If there's warranty on the system, you can ask Dell for a free hard drive replacement?Warranty Status
, its two years old.
And when i went through extended hard drive test, it passed the test.
So is it OS failure.
If hard drive (or solid state drive) is detected in the BIOS, reinstall windows 10 to see if that will get the computer up and running again. You can do this by creating a windows 10 installation media from the Microsoft website in link below. You'll need a blank USB flash drive with at least 8GB of space and a good working computer to download the windows 10 ISO file.
After creating the bootable windows 10 flash drive:
1. Insert the flash drive into a USB port of the computer that needs to be fix and then power off system.
2. Power on system, quickly start tapping F12 key continuously until you see Preparing one time boot menu in the top right corner of the screen.
3. At the boot menu, select the windows 10 flash drive under UEFI BOOT
4. Select your keyboard language, time and currency format in the windows setup screen.
5. Select Install Now to reinstall windows 10
If the computer still doesn't boot back into windows with the bootable windows 10 installation media, I believe it's probably best to just purchase a brand new drive and install it into the computer.
The system supports one 2.5‑inch hard drive, one 7 mm drive solid state drive.
Inspiron 15 7568 Specifications:
Inspiron 157000 Series Service Manual:
You can purchase a drive from Dell Parts & Upgrades in link below:
Or from a third party such as Ebay, Amazon or Parts People:
Keep this in mind:
Inspiron 15 (7568) compatible upgrades: