Weird boot device not found error.

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Dell Latitude 5490

Dell Latitudeシリーズは、主にプロフェッショナル向けに設計されています。本モデルはDellから2018年に発売された14インチのノートパソコンです。Dell Latitude 5490は耐久性、携帯性、セキュリティを重視しており、長い製品サイクルで知られています。

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John Doe @johndoe23811

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投稿日: 2026年8月27日

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Weird boot device not found error.

I'm losing my mind here and would highly appreciate any proper help.

My problem is obvious from the title. A temporary solution i have is to just take out the ssd and put it back in at which point it works perfectly for a couple or few days before freezing where the only way out is a restart through the power button where I'm met with the same error again. How do I fix this problem permanently?

Reinstall my OS (I use Linux Mint)?

Changing the UEFI option in the boot menu and back didn't do anything.

Maybe it's a problem with the motherboard?

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jayeff @jayeff 評価: 549.4千 11 423 1.6千 · Answer 1 · 2026-08-27T01:13:59-07:00

Hi @johndoe23811

When the error occurs, if you restart the laptop and get in BIOS on startup, does the SSD information i.e. make and model number, appear in BIOS > System Information > Device information?

If it does this may indicate that the boot partition in the SSD is corrupted.

Perhaps check if the RTC coin cell battery voltage is OK.

Here's the owner manual for the laptop. Go to p.19 to view the procedure to remove the coin cell battery from the motherboard.

Regarding the main battery, you don't have to remove it, just disconnect the battery cable from the motherboard.

When the coin cell battery is out, if it is <2.4V DC or if the battery is >4-5 years old, replace it. Search online for C8KT2 to find suppliers that suit you best.

Before reconnecting the coin cell battery (either original or replacement) press and hold the laptop's Power button operated for a full 30 seconds and then release it.

Then reinsert and connect the coin cell battery, reconnect the main battery, close the laptop, connect the charger and check if it turns on and boots OK.

If it does there may be a message stating that the date and time are incorrect. This is normal as the BIOS has been reset back to factory default by the above. Once the date and time have been corrected, the message won't appear the next time the laptop is turned on.

Also any user definable BIOS settings that were changed by you to suit whatever system requirements you had, will need to be changed back again also.

Dell Latitude 5490

Weird boot device not found error.

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