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Common Error Messages & What They Mean

Windows and Mac errors, explained plainly.

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Seeing a cryptic error message or code is unsettling, especially when it stops you from using your computer at all. Below are the most common Windows and Mac errors we're asked about — what they generally mean, and what we do to fix them. We always diagnose the specific cause rather than guessing, since the same error message can have several different underlying causes.

Windows

Windows errors

Blue Screen of Death (BSOD)

Windows displays a blue screen with an error code when it hits a critical error it can't recover from safely. The specific code is a clue, not a full diagnosis — we test the actual hardware and check system logs rather than relying on the code alone.

Error code	What it usually points to
`MEMORY_MANAGEMENT`	Faulty RAM, corrupted system files, or a bad driver
`PAGE_FAULT_IN_NONPAGED_AREA`	Faulty RAM, failing drive, or driver conflict
`CRITICAL_PROCESS_DIED`	A core Windows process crashed — corrupted system files or a bad driver update
`SYSTEM_THREAD_EXCEPTION_NOT_HANDLED`	Usually a driver issue, often graphics or network drivers
`IRQL_NOT_LESS_OR_EQUAL`	Driver conflict or faulty RAM
`KERNEL_SECURITY_CHECK_FAILURE`	Corrupted system files or driver issue
`DPC_WATCHDOG_VIOLATION`	Driver or storage controller issue, especially after Windows updates
`VIDEO_TDR_FAILURE`	Graphics driver crash or failing GPU
`WHEA_UNCORRECTABLE_ERROR`	Hardware fault — often CPU, RAM, or motherboard
`INACCESSIBLE_BOOT_DEVICE`	Windows can't access the boot drive — failing drive or driver/BIOS setting issue
`Hex codes (e.g. 0x0000007E, 0x0000008E, 0x0000007B)`	Older-style codes, same general causes as above — driver, hardware, or corrupted files

Windows 11-specific issues

“This PC can't run Windows 11” — usually a missing TPM 2.0 chip, Secure Boot not enabled in BIOS, or incompatible CPU. We can check whether your machine can be made compatible or advise honestly if it can't.
Update-related freezes or rollback loops after a Windows 11 feature update — often driver incompatibility with the new update.

“Your PC ran into a problem and needs to restart”

The everyday-language version of a stop code error (Windows 10/11's friendlier BSOD wording). Same underlying causes as above.

Computer won’t boot / stuck on startup logo

Can point to a corrupted operating system, a failing drive, or a hardware fault preventing Windows from loading. We diagnose whether it’s a quick software fix or something more serious.

“Operating System Not Found” / boot device errors

Usually means the computer can’t find a working drive with an operating system on it — often a failing or disconnected hard drive/SSD, sometimes a BIOS/boot order setting.

Frequent freezing or random restarts (no error message)

Often overheating (dust buildup, failing fans), failing RAM, or a drive nearing failure — same root causes as BSOD errors, just without a specific code shown.

Mac

Mac errors

Kernel panic

The Mac equivalent of a Windows BSOD — macOS hits a critical error and restarts to protect itself. A single occasional panic usually isn’t urgent, but repeated panics point to a real hardware or software problem — often faulty memory, a failing drive, or incompatible software.

Prohibitory symbol (circle with a line through it) at startup

Means macOS can’t boot from any available drive — often due to corrupted system files, a failing drive, or (on Intel Macs) startup disk selection issues.

Spinning wheel / beachball that won’t go away

Usually indicates the system or an app is overloaded — could be a failing drive, insufficient free storage, or a specific app hanging rather than the whole system.

Folder with a question mark at startup

Means the Mac can’t find a valid startup disk — commonly a failing drive or a corrupted macOS installation, not necessarily a fully dead drive.

Gray screen at startup (no progress)

Can indicate a startup disk issue, incompatible startup items, or in some cases a hardware fault preventing the boot process from completing.

FAQ

Error messages — common questions

Do error codes mean the same thing on every Windows version?

Largely yes, though some codes are more common on certain versions — we diagnose the actual cause regardless of code.

Can an error code appear intermittently without being serious?

Occasionally, though repeated occurrences of the same error are worth having checked.

Should I try to fix an error code myself before bringing it in?

Basic steps (a restart, checking for obvious cable/connection issues) are fine to try. Beyond that, especially for BSODs or kernel panics, we'd recommend bringing it in rather than risking further data loss from repeated troubleshooting attempts.

Does a blue screen or kernel panic mean I've lost my data?

Not necessarily — these are safety mechanisms, not data-destroying events by themselves. The risk comes from an underlying failing drive, which is exactly what we check first.

Can you tell what’s wrong just from the error code?

The code narrows down the possibilities, but we always verify with actual diagnostics rather than assuming — the same code can point to several different root causes.

Got one of these errors?

We diagnose the root cause, not just the code. Free diagnostics (2–4 days) or express (600 kr, 1–2 hours), fixed quote before we start.

Book diagnostics 📞 Call 91 81 61 81

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