Data Recovery Case File · Mac & Apple Ecosystem · Two Questions, Not One

Find Out What You Already Have

Her enquiry contains two problems presented as one. A desktop machine where "last week when we turned it on there was a blank screen apart from a prohibitive sign. We can reboot the Mac but are unsure if our external hard drive has all our photos" — more than twenty thousand of them. Those are separate questions with separate answers, and only one of them needs anybody's help. Whether the backup holds everything is answerable today, at no cost, and the answer determines whether the first question matters at all.

The decode: what the symbol means, and how to check a backup without the machine

What the crossed-circle symbol reports: that the machine looked for a system to start from and did not find one. That is all. It does not indicate a failed drive, a damaged disk or lost files — it is the firmware saying there is nothing bootable here. The cause may be a failed drive, a corrupted system, or a boot setting, and the symbol does not distinguish between them.

Why the second question is the one to answer first: if the backup drive holds all twenty thousand photographs, the internal drive becomes a repair question rather than a recovery one — and repairing or replacing a machine is a completely different decision made with far less pressure. If the backup is incomplete, the gap defines exactly what a recovery needs to target. Either way the answer changes what happens next, and it costs nothing.

How to check it without the machine working: connect the backup drive to any other computer. Its contents are readable independently of the machine that made them — a backup drive is storage, not a component of the desktop. If the backup was made with the system's own backup software, browsing it on a different machine of the same platform is straightforward; on a different platform the folder structure is usually still visible enough to count and spot-check even where the format is proprietary.

What to check specifically, rather than glancing: three things. The most recent date in the backup, because a backup that silently stopped a year ago is the commonest way this goes wrong. The count — they know it is more than twenty thousand, which is a genuinely useful figure to reconcile against, and most people cannot say. And a sample opened at full size, since a folder that looks full can contain previews rather than originals.

Why the count matters so much here: it converts a vague worry into a test with a result. Twenty thousand expected against nineteen thousand found is a specific gap that can be located by date; twenty thousand against four hundred is a different conversation entirely.

What to do about the machine meanwhile: stop restarting it. If the internal drive is failing, repeated start-up attempts are repeated demands on a struggling mechanism — and until the backup has been checked there is nothing to be gained by trying again.

On the bench

The backup drive's contents were enumerated and counted independently of the machine, since a backup drive is storage rather than part of the desktop and its completeness is answerable without the machine working — which determines whether any recovery is needed at all. The photograph count was reconciled against the owners' stated figure, and the most recent backup date established, since a silently stopped backup is the commonest failure. The internal drive was assessed separately, and recovery scoped to confirmed gaps only.

The outcome

The backup enumerated and reconciled against the owners' count first, the internal drive assessed separately and recovery scoped to what was genuinely missing. Free assessment, one fixed written figure including VAT; where a drive has to be opened, 50% of parts and labour is payable upfront with the balance only on success — otherwise no recovery, no fee. The decode, for anyone in this position: these are two questions and the cheaper one comes first. That symbol only means no startup system was found and says nothing about your files. Connect the backup drive to any other computer and check three things — the most recent date, the count against what you expect, and whether a sample opens at full size.

Our case files are drawn from genuine enquiries received by our laboratory over the past ten years, anonymised to protect client confidentiality. Each one describes the diagnostic and recovery procedure our engineers apply to that fault, using the equipment listed.