Hardware Problems
What it means when a computer shows no sign of life at all, and what's worth checking before assuming the worst.
When a computer shows no sign of life at all — no lights, no fans, no display — that's almost always a hardware fault rather than something Windows-related, since Windows never gets the chance to load in the first place. The cause differs between desktops and laptops, and between a computer that's completely dead versus one that powers on but shows nothing on screen. The guide below walks through what's worth checking before assuming the worst, and when it's time for a proper diagnosis.
Computer Won't Turn OnNo lights, no fans, nothing on screen. What usually causes it, what's safe to check yourself, and when it needs a proper diagnosis.Computer Turns On but No DisplayLights and fans running, but nothing appears on the monitor. What usually causes it and what's safe to check yourself.Computer Keeps RestartingThe computer restarts on its own, sometimes repeatedly, without you telling it to. Common causes and what to check.Computer Randomly Shuts DownThe computer turns off completely rather than restarting, with no warning. What tends to cause it and what to check.Computer OverheatingA desktop that's hot to touch, loud, or shutting down under load. What usually causes it and what's worth checking.Computer Making Strange NoisesBeeping, buzzing, grinding or rattling from inside the case. What different noises tend to mean.USB Device Not RecognisedA USB device, drive or port that stops working or won't be detected. Common causes covering both the device and the port itself.Second Monitor Not DetectedA second monitor that won't show up, including over HDMI. What to check on the cable, port and display settings.Why Is My Computer Fan So Loud?The most common reasons a computer fan is louder than it used to be.Why Does My Computer Get Hot?Why computers generate heat, and where the line is between normal warmth and a genuine problem.Is My Computer Worth Repairing?How to weigh up a repair cost against a computer's age, condition and remaining useful life.What to Do Before Taking a Computer for RepairPractical steps worth taking before a drop-off, if the computer is still usable enough to do them.How Long Should a Desktop Computer Last?A realistic expectation for desktop lifespan, and what typically determines it.What Happens During Computer Diagnostics?What a proper diagnostic assessment actually involves, so you know what to expect.