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MHDR / Common faults / No power, or nothing detected

The fault · the disk never appears

Hard drive not detected? Maidenhead. Most often it is the board that failed, not the platters behind it.

The electronics around a disk fail far more readily than the surfaces inside it, so a drive that has vanished from a Maidenhead machine has usually kept what was written to it. Work down the three levels — BIOS, Disk Management, Explorer — and the one it drops out at tells you whether the fault is a board, firmware or a file system.

No fee unless the data comes back Diagnosis free, then a fixed quote Post it in from Windsor, Slough or anywhere else

Describe the fault to an engineer
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A hard drive not detected: what each symptom means.

None of these? Run the triage →
The signsThe likely causeStart here
Disk Management: Unknown, Not InitializedThe drive replies, yet Windows finds neither a disk signature nor a partition tableDo not initialise it
The Initialize Disk prompt: “…before Logical Disk Manager can access it”Windows offering to write a fresh signature across your filesSay no, then power it off
No Media shown in Disk ManagementThe controller answers and nothing behind it does; in practice this is a hardware failure, not a logical oneStop connecting it
No drive listed in the BIOSElectronics or firmware: a burnt board, a diode that absorbed a surge, damaged service-area codeA bench-and-iron job
BIOS reporting the wrong size: 1TB shown as 8MBFirmware or translator damage; the drive can no longer state its own capacityA firmware job, well beyond any software
Silent, unlit, not spinningA dead board; the TVS diode has normally taken a surgeStrong prospects
If you post it in: use a tracked, insured service addressed to our secure intake lab, and the return leg is paid at our end; if you would rather check the packing first, an engineer will go through it by phone. Each step is set out on the postage page.

Where the hard drive disappears tells you what has broken.

Missing at BIOSThe lowest of the three. A fault at this depth is electronic or firmware in character — a failed PCB, a shorted diode, damaged code in the service area — and the recorded data is ordinarily intact.
Seen by the BIOS, not by Disk ManagementThe hardware is sound and the damage is to the partition table or the file-system metadata, which is logical work carried out on an image.
Everywhere but File ExplorerThe volume will not mount although everything beneath it is sound. A file-system fault, with good odds.
Not a flickerOn a hard disk this normally reads as surge damage, with the TVS diode shorted. The complication is that a replacement board alone will not do: the calibration belonging to your drive lives in its ROM chip, which has to come across too.

What happens between arrival and return.

The most recent cases →
01

Booked in, then assessed at no cost Free

Nothing becomes chargeable until you have said yes to it. Each item takes a case number of its own the moment it arrives, an engineer establishes what has actually failed, and you are given a candid view of which files stand a realistic chance of returning. The single quote that follows is fixed, written down, and costs nothing.

Diagnosis at no costOne fixed quote, in writingNothing signed
02

Find where it drops out

None of this needs the drive opened or run for long. Minutes spent stepping down through BIOS, Disk Management and File Explorer settle which of three you have: a board to repair, a damaged service area, or a logical fault.

One level at a timeNothing written to the disk
03

Restore the electronics

A shorted diode is unsoldered and renewed; a board past saving gets a donor. Either way the ROM from your own drive travels across, because the adaptive values it holds were measured against your platters and no other chip will do.

Donor PCB, your own ROMBlown diodes resoldered
04

Take the image, then rebuild on it

The moment it answers, a full image is taken; the file system is then rebuilt against that copy while the drive itself sits untouched on a shelf.

A complete imageThe drive itself set aside
05

Opened, verified, and sent home

Nothing is billed until you have seen the recovered file list in full and told us to go ahead. What comes back arrives on new media, with the return journey at our cost, and the case stays open at this end until you have opened every file yourself.

You approve the list firstReturned on fresh mediaThe return post is ours

What tends to show up first

  • Each level has its own suspects — a disk can fall away at BIOS, at Disk Management, or only once Explorer tries to mount it, and the three point at quite different components. Settle which, and most of the diagnosis is done.
  • A TVS diode is built to be sacrificed — it shorts out and absorbs the surge so nothing downstream has to, which is why drives with no sign of life so often hold sound platters.
  • An identical board is not a spare — a modern drive's adaptive values are unique to it and held in ROM, so unless that chip is transferred the donor is calibrated for another disk entirely.
  • Flash fails by another route — a controller fault or a firmware panic walls off NAND that is entirely healthy; the WD Blue SA510 is known for reporting 0MB. More on the SSD page.

Worth remembering: the great majority of undetected drives reaching this bench have failed in their electronics or their firmware, which is the apparatus built around your data rather than the data itself. Not appearing and not existing are two very different findings.

From the casebook, lately.

MH · MHD-2026-6618ON RECORD ✓

One TVS diode gone, and a WD desktop drive stayed dark

The supply failed overnight and the desktop came back without its second disk: no spin, nothing in the BIOS. The board had burnt through at the TVS diode. Its ROM chip moved to a donor, and the disk was imaged in full inside two days of arriving.

100% imaged2 days from arrival

Before the undetected hard drive comes to the lab.

Do these now

  • Try one other cable and one other port, then stop
  • Note whether anything spins up, or nothing does
  • Tell us about any outage, surge or lightning
  • Send it as found, case unopened

Things best not done

  • Accepting the Initialize Disk prompt
  • Swapping in a board from the same model; the adaptives differ
  • Testing it on every computer you have
  • Buying a donor drive to move the PCB yourself

The questions that arise most often.

Is anything recoverable from a drive with no power?

Frequently it is. Electronics can be repaired or replaced, and what lies behind them, platters or flash, is generally untouched by whatever killed the board. Drives with no power at all give some of the better outcomes we see.

Windows offers to initialise it. Do I accept?

Decline it. Initialising lays a fresh signature over the structure that records where everything on the disk begins. Refuse, switch the drive off, and have it examined.

Nothing appears in the BIOS. Does that settle it?

Seldom, on its own. A disk the BIOS cannot see is one that has stopped talking, and silence of that kind implicates the board or the service area, not the data.

It died after a power cut. Is that the cause?

Very often, yes. A surge is normally absorbed by the protection diode on the board, a part fitted precisely so it fails first. The PCB is lost; the data is not.

More of the jobs we've closed.

Fitted drives → SSDs and NVMe drives → Soaked or scorched → Media we work with →

Switched off, it keeps every chance it has.

Each further power-up asks more of a drive that has already begun to fail. Open the case first and let the free diagnosis tell you what is left.

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Ask for a free diagnosis Posting it to us