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Inspiron 5570, no bootable devices found
Bought a refurbished Inspiron 5570 last month. It's been working fine until now. Today when I tried to start, it would run diagnostics and say no problem detected. After diagnostics, it says "No bootable devices found". The only option in the screen is Shutdown. In BIOS, it does detect primary HDD. Boot sequence only has UEFI option. Tried to restore default setting in BIOS without any luck. Tried to disable "secure boot" as per other thread but no luck. Can someone help?
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DELL-Nat M
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Posted June 27th, 2022 12:00
Note 1: If the operating system is installed with UEFI before boot sequence is changed, the system can be recovered by changing Boot sequence back to UEFI.
Note 2: If the operating system is installed with Legacy mode, You can try and recover the OS by changing the Boot sequence back to Legacy mode and check if the system boots into Windows, if that fails, then, Operating system reinstallation should be performed. (Data loss risk)
1.Turn off the computer.
2.Disconnect all devices such as USB drives, printers, webcams, media cards (SD/xD), except the keyboard and mouse.
3.Run ePSA Diagnostics on the hard drive.
4.Turn on the computer to see if the system boots to Windows.
5.If the system doesn’t boot to Windows, then follow the steps mentioned in the link: https://www.dell.com/support/contents/en-in/article/product-support/self-support-knowledgebase/fix-common-issues/no-boot
6.If that fails, Use the "Get Help Now" option at the bottom right to start a LIVE chat session.
•Ensure that you keep your System Service Tag handy.
#IWork4Dell

Go to Bios Set UP . Disable the secure boot . 2)"" Advanced Boot option" on the left side ,make sure that ""Enable legacy option ROM "" is selected 3) Now Go to "Boot sequence " and select "Legacy" in Boot list. Restart computer and you can see the Boot devices list
In the meantime, please check out Dell video in the link below. Hopefully it will help get computer up and running again. Good darn video I like to add !
Fix Boot in Windows 10 (Official Dell Tech Support)
I dont see Boot manager exactly. However, I see Boot Sequence in F2 which is set to UEFI. I dont see Boot options (IPV4, IPV6). Attached are the screenshot of F2 and F12. I restored the settings to default and that enabled the secure boot. And now I get this error "OS Loader has no signature. Incompatible with SecureBoot. All bootable devices failed Secured Boot verification". Screenshot attached as well.

LSUFAN51
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Posted February 24th, 2018 11:00
Please check out geto's possible solution in the link below.
Inspiron 13, No bootable device found
No boot device found when you change the Boot sequence to Legacy mode or install OS under Legacy mode