The short answer
The point where startup stops is the first useful clue
No lights or fan activity can indicate a power problem. Lights with a black screen may involve the display or hardware. Reaching a logo, spinning dots, Automatic Repair or an error usually means the computer has power but Windows has not completed startup.
Try only the low-risk checks that match the symptom. Do not choose Reset this PC, reinstall Windows, initialise or format a drive until you understand what will be removed and have protected any important files that are still recoverable.
Write down exactly what happens
A photograph of the last visible screen or exact error wording is often more useful than saying the computer is “dead”. Note whether the problem followed an update, power cut, drop, liquid spill, new device or unusual noise.
- No power, lights or fan movement at all.
- Power lights or fan activity, but the display remains black.
- The manufacturer’s logo appears, but Windows goes no further.
- Spinning dots continue, the computer restarts repeatedly or Automatic Repair appears.
- A blue error screen, BitLocker recovery prompt or other message appears.
- Windows reaches sign-in, but the desktop does not load normally.
Six checks to try without opening the computer
These checks assume there is no burning smell, liquid damage, swollen battery, unusual drive noise or other immediate safety warning.
Check power and the display
Confirm the wall socket or power strip works and that power leads are firmly connected. On a desktop, check that the monitor is switched on and its input has not changed. On a laptop, connect the correct charger directly and look for a charging indicator. Do not open a power supply or use a visibly damaged cable.
Disconnect non-essential accessories
With the computer switched off, remove external drives, docks, printers and other optional USB devices. Leave the display, keyboard and mouse connected where needed, then try one normal start. A faulty accessory or bootable drive can sometimes interrupt startup.
Allow one complete restart
If the computer is frozen but shows no physical warning signs, hold the power button only long enough to switch it off, wait briefly and start it once. Repeated forced shutdowns are not a diagnostic method and may add risk when storage is failing or Windows is updating.
Let Windows recovery appear naturally
After repeated failed starts, Windows may enter the Windows Recovery Environment automatically. If it does, note the options and any error before continuing. Some recovery tools require the 48-digit BitLocker recovery key, so locate the correct key before selecting them.
Try Startup Repair when recovery is available
In Windows Recovery Environment, Microsoft directs users to Troubleshoot, Advanced options, Startup Repair and Restart. Startup Repair checks for certain damaged system files and boot-configuration problems. It cannot repair every hardware or Windows fault, and an encrypted device may request its BitLocker key.
Use later recovery choices only when you understand the impact
If the issue began after an update, Windows Recovery Environment may offer Uninstall Updates. Other options such as restore, reset or reinstallation can undo changes, remove applications or erase data depending on the choice. Read the summary shown on the computer, connect it to reliable power and seek advice if the backup or recovery-key position is unclear.
Common reasons a Windows PC stops starting
Startup failures can come from a flat or faulty power source, a display problem, an attached device, an interrupted update, damaged Windows files, an incorrect boot setting, overheating, failing storage or another hardware fault. A BitLocker screen is different again: it means the encrypted drive needs its recovery key before Windows can continue.
The visible symptom narrows the possibilities but does not prove the cause. Avoid buying parts, changing firmware settings or reinstalling Windows solely from an online guess.
Stop and seek help
Protect the device, your files and your account access
Stop further startup attempts when the next action could worsen physical damage or make important information harder to recover.
- There is smoke, a burning smell, liquid damage, a swollen battery, sparking or unusual heat. Disconnect power only when it is safe to do so.
- A storage drive clicks, grinds, repeatedly disappears or important files were missing before the startup failure.
- Reset, reinstall, format, initialise or recovery-media options are being proposed and there is no verified backup of important files.
- A BitLocker key is requested and you cannot match the key ID to a recovery key. Do not share that key in an enquiry message.
- The device belongs to an employer, school or another organisation. Contact its IT administrator before changing recovery, encryption or account settings.
- The computer repeatedly crashes or shows changing error codes after the safe checks above.
A reset or reinstallation is not the first step when files matter
Microsoft’s recovery choices have different effects. Startup Repair is intended to address certain startup problems. Uninstall Updates removes a selected update. Reset this PC reinstalls Windows and removes applications and settings, even when the option to keep personal files is selected. A clean installation can remove files, applications and settings entirely.
If the only copy of important data is on the computer, establish whether the storage device is healthy and whether the files can be backed up before using destructive recovery options. File recovery cannot be guaranteed, particularly when hardware is failing.
When to ask West Lothian IT
Get the startup problem assessed before choosing reset or replacement
West Lothian IT can assess Windows startup problems for desktops and laptops around Livingston and West Lothian. Share the make or model, the last screen shown, any exact error and what changed before the fault. Workshop assessment, an agreed visit or another suitable next step can then be discussed according to the symptoms and availability.
Official Windows guidance
Microsoft’s recovery pages explain the available Windows tools and the different effects they can have. Options vary by Windows version, device configuration and whether the computer is managed by an organisation.