“My computer won’t turn on” describes four completely different situations — and the cause and fix for each one is different. The most common mistake is treating them all the same way. Before trying anything, identify which symptom you have. This takes 30 seconds and points you directly at the relevant fix.
Symptom 1: Completely dead — no lights, no fan, no sound, nothing
What it usually means: power not reaching the computer
When there’s absolutely no response — no lights, no fan spin, no beep, no display — the computer isn’t receiving power, or something has interrupted the power circuit. This is one of the more recoverable situations because the issue is usually electrical, not a loss of data.
Try these in order:
- Try a completely different power point — surge protectors and power boards sometimes fail silently. Plug directly into a wall socket.
- For laptops: Check the charging cable at both ends (the wall end and the laptop end) — a slightly loose connection can cut power. Try a known-working charger if available.
- For desktop PCs: Check the power cable at the back of the PC is firmly seated. Also check the surge protector or power board — press the reset button if there is one.
- Power drain reset (laptops): Unplug the charger. If the battery is removable, remove it. Hold the power button for 30–45 seconds. Reattach the battery and charger, then try again. This drains residual charge from capacitors and often resolves a “completely dead” laptop.
- Remove all external devices — USB drives, external hard drives, monitors, mice. Some computers refuse to boot when an unrecognised USB device is present.
If none of these work: The power supply unit (desktop) or charging circuit / motherboard (laptop) may have failed. These require hands-on diagnosis — a technician can test with a known-good power supply or multimeter. Data is almost certainly safe at this stage as the storage drive is typically unaffected by power failures.
Symptom 2: Lights come on and fan runs, but screen stays black
What it usually means: display connection problem or Windows startup failure
The computer is receiving power and starting up — but something is preventing the image from appearing on screen. Two very different causes: a physical display connection issue, or Windows failing to start properly while the hardware itself is working.
Try these in order:
- Wait 60 seconds — sometimes Windows is loading and simply hasn’t reached the point of displaying anything yet. If you can hear the Windows startup sound or hear hard drive activity, wait longer before assuming it’s not working.
- Check the screen brightness — on laptops, the screen can occasionally be set to zero brightness accidentally. Press the brightness-up key (usually Fn + a function key with a sun symbol) several times.
- For desktops with a separate monitor: Check the cable between the computer and monitor (HDMI, DisplayPort, or VGA). Unplug and firmly reseat it at both ends. Try a different input on the monitor (press the Input/Source button on the monitor).
- External monitor test (laptops): If you have an HDMI cable and a TV, connect the laptop to the TV via HDMI. If the laptop image appears on the TV, the laptop screen itself or its connection has failed — but the computer is otherwise working fine and data is safe.
- Try Windows Safe Mode: Hold the power button to force-shut down. Turn on and immediately press F8 (or F2/F12 depending on brand) repeatedly to access boot options. Try “Safe Mode” — if the screen appears in Safe Mode, Windows has a software issue rather than a hardware one.
If the external monitor works but the built-in screen doesn’t: The laptop screen or its ribbon cable has failed. This is a hardware repair — screen replacement or cable reseating. The good news: the computer is working and all data is accessible. This is distinct from the screen cracking physically — if the laptop was dropped, that’s visible damage.
Symptom 3: Starts for a few seconds then immediately shuts off
What it usually means: overheating protection or failing hardware
A computer that starts — fans spin, lights appear — then shuts off within 5–30 seconds is almost always triggering its own safety mechanism. Modern computers shut down immediately when the processor reaches dangerous temperatures, rather than risk damage. This is the same protection mechanism described in our laptop overheating guide — but here it’s triggering before the computer even finishes starting up.
What to check:
- Let it cool completely — if the computer was running recently and overheated, wait 30–60 minutes before trying again. If it starts successfully after cooling, dust buildup in the cooling system is almost certainly the cause.
- Check the vents are not blocked — ensure nothing is covering the air vents. On a laptop, make sure it’s on a hard flat surface, not a bed or cushion.
- Listen for the fan — if the fan is completely silent during the brief startup, the fan may have failed entirely. A computer without a functioning fan will overheat and shut down within seconds.
- Check the RAM (desktops only) — on desktop computers, if a RAM stick has become loose, the computer often powers on briefly then fails. Open the side panel and press down firmly on each RAM stick until it clicks. This requires some confidence but is generally safe and often fixes the problem immediately.
If cooling doesn’t solve it: The power supply (desktop), battery/charging circuit (laptop), or another hardware component may be failing. This needs hands-on diagnosis. Data is usually safe unless the hard drive itself is affected — see the data safety section below.
Symptom 4: Gets to the Windows logo then freezes or restarts in a loop
What it usually means: Windows startup failure — hardware is probably fine
If you can see the Windows logo (the four-colour flag) before the computer freezes or restarts, the hardware is likely working. The problem is Windows failing to start correctly — almost always caused by a corrupted Windows update, a failed update installation, or a driver conflict. This is one of the more fixable scenarios.
The Windows automatic repair approach:
- Force-shut down the computer by holding the power button until it turns off
- Turn it back on — if it fails at the logo again, force-shut down again
- Repeat this 3 times — Windows detects the repeated startup failures and automatically launches “Automatic Repair” mode on the 3rd or 4th attempt
- In Automatic Repair: click “Advanced options” → “Troubleshoot” → “Advanced options” → “Startup Repair”
- Let Startup Repair run — it diagnoses and attempts to fix the startup problem automatically
Windows Fast Startup note: Windows 10/11 has a “Fast Startup” feature that doesn’t fully shut down the computer — it saves a partial state to speed up restarts. If a Windows update partially installed while Fast Startup was active, it can corrupt the startup state. In Automatic Repair → Advanced options → Command Prompt, type shutdown /s /f /t 0 to do a complete shutdown, then start fresh.
If Startup Repair doesn’t work: More advanced Windows recovery options — including System Restore (roll back to before the update problem), or reinstalling Windows while keeping files — are available in the same Automatic Repair menu. We handle these during home visits. Data is typically safe in all boot loop scenarios unless the hard drive is simultaneously failing.
Is your data safe? What each symptom means for your files and photos
The question everyone asks when a computer won’t turn on is: “Are my photos and documents lost?” The honest answer depends entirely on what’s causing the problem — and in most cases, data is safer than people fear.
| Symptom | Data at risk? | Why |
|---|---|---|
| Completely dead — power issue | Usually safe | Power failures don’t affect storage drives. Data is intact — we just need to get power working to access it. |
| Lights on, black screen | Usually safe | Display or Windows startup issue — not storage. The drive is typically accessible even if the screen isn’t working. |
| Starts then shuts off | Usually safe — check | Likely a power/heat issue, not storage. However, if overheating has been ongoing, prolonged heat exposure can eventually damage drives. Worth checking sooner rather than later. |
| Stuck on Windows logo / boot loop | Almost always safe | Windows startup failure doesn’t affect the data stored on the drive. Files are intact — we just need to repair the Windows installation. |
| Clicking or grinding noise on startup | At risk — act now | Clicking or grinding is a mechanical hard drive failing. Do not keep trying to start it. Get it to a technician immediately — every power-on attempt can cause further damage and reduce the chance of data recovery. |
If the old computer has important files and you’ve decided to move to a new machine anyway — even if the old one won’t turn on, data recovery may still be possible. See our file transfer guide for what’s involved, and let us know the old computer isn’t starting when you book — we bring the right tools for drive extraction.
Frequently asked questions
Yes — if the battery has discharged completely (below a certain voltage threshold), the laptop may not respond at all to the power button even when plugged in. This is because the battery needs to reach a minimum charge level before the power circuit activates. Plug it into the charger and wait 10–15 minutes without pressing anything. Then try the power button. If it still doesn’t respond, try the power drain reset from Symptom 1 (unplug charger, hold power button 30 seconds, reconnect charger, try again). If neither works after 20 minutes of charging, the battery or charging circuit has failed beyond a simple flat battery.
This is one of the most common causes of the boot loop (Symptom 4). Windows updates sometimes fail partway through — particularly if there’s a power interruption during installation, or if there’s a driver conflict with your specific hardware. The computer gets stuck trying to complete an update it can’t finish. Use the Automatic Repair approach from Symptom 4 above. The “System Restore” option in Automatic Repair can roll Windows back to before the problematic update was installed, which fixes the vast majority of update-related boot failures. Data is not affected by this process.
Usually not. The most common causes — power supply failure, flat battery, Windows startup corruption, dead screen — are all fixable without replacing the computer. Even a failed hard drive doesn’t mean the rest of the computer is finished; the drive can be replaced and the computer continues working. The cases where replacement is the better option: a failed motherboard on an older laptop (repair cost exceeds value), or a laptop where the screen, battery, and hard drive have all failed simultaneously on an old machine. We give an honest cost-versus-replace assessment during the visit before quoting on any repairs. For the broader fix-or-replace decision, see our old computer running slow guide.
Very urgent. A clicking or grinding noise from inside the computer (not from a speaker or fan) almost always indicates a mechanical hard drive failing. The “click of death” — a repetitive clicking sound — means the drive’s read heads are struggling to reach the magnetic platters, typically due to a head crash or motor failure. Every time you power on a failing drive, you risk causing further physical damage that makes data recovery harder or impossible. Do not continue trying to start the computer. Call us on 0435 955 429 for advice on next steps — we can assess whether professional data recovery is feasible and cost-effective before recommending a course of action.
Yes — we diagnose and fix all four symptom types during home visits across Melbourne. We bring test equipment including a known-good power supply for desktop testing, HDMI cables for screen bypass testing, and a USB Windows recovery drive for startup repairs. We give an honest assessment upfront before any repair — if the cost of repair isn’t justified against the computer’s age and value, we’ll tell you. If data recovery is needed alongside the hardware fix, we handle that in the same visit where possible. $89/hr, no call-out fee, all Melbourne suburbs. Call 0435 955 429 or book online.
Computer not turning on?
We come to your home with test equipment, diagnose the exact cause, and fix it — or give you an honest assessment if replacement makes more sense. $89/hr, no call-out fee, all Melbourne suburbs. If clicking noises are involved, call us first before trying to turn it on again.
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