SSD not detected: the laptop that says "no bootable device"

A laptop that suddenly cannot see its storage (BIOS shows no drive, Windows setup finds nothing, macOS says "no bootable device") is one of the most mis-quoted faults in repair. The drive itself, the slot, the board's storage power and the BIOS are all candidate causes, and they have different answers. This is the order that finds out which one it is, and what each outcome means for the customer's data.

The five-minute order of checks

1. Reseat the drive if it is removable (NVMe/SATA). Mechanical looseness after a drop is common and free to fix.
2. Check the BIOS drive list: "not detected" there is the useful finding. A drive that appears but does not boot is a different, friendlier case.
3. Test the drive elsewhere, or a known-good drive in the machine. This single swap splits "drive fault" from "board fault". The fork that decides everything downstream.
4. Look at the slot for bent pins, debris or corrosion, especially on slotted drives after a spill.
5. On soldered storage (most MacBooks, many ultrabooks): there is no reseat. The storage path is the board, and the conversation is a board diagnosis.

What the fork means for the data

• The drive is fine, the board cannot see it: the data is sitting safely on a working drive, and the job is board-level: storage power rails, SATA/NVMe circuitry, or the connector on the board. With the £120 + VAT board repair, the machine comes back knowing where its data is again.
• The drive died, the machine is fine: now it is a data question. A removable drive can often be imaged directly, subject to encryption (BitLocker keys, explained). This is the easier half of the fork.
• Soldered storage, board dead: the soldered SSD guide owns this case: repair the board so it boots, or the recovery desk (launching soon) takes over.

The rule that protects the data

Stop powering it on. A laptop that cannot find its storage is exactly the machine where ten more hopeful restarts turn a recoverable situation into an unrecoverable one, especially if there was a drop, a spill or a clicking sound in the story. Note the history, power it off, and get it to a bench. Diagnosis is £35 + VAT, waived when the repair goes ahead, and for customers whose data matters most, that thirty-five pounds is the cheapest insurance in this guide.