Computers rarely fail without warning. They give off signs for weeks or months first, and almost all of those signs are easy to dismiss as "it's just getting old". Catching them early is routinely the difference between a $60 fix and a dead machine with your files on it.
Here are the five we see most often, what each one usually means, and how urgent it is.
1. It takes minutes to start up
If your computer used to boot in under a minute and now takes four or five, something has changed. The usual causes are a failing mechanical hard drive, too many startup programs, not enough RAM, or malware running in the background.
The drive is the one to take seriously. A mechanical drive that is starting to fail slows down first — it retries bad sectors, and every retry is time you sit watching a logo. That is a warning, and the window between "slow" and "will not boot at all" can be short.
2. It runs hot, or the fan never stops
A laptop that is uncomfortable to touch, or a fan that sounds like a hairdryer while you are reading email, means the cooling system is not doing its job. Usually the vents are packed with dust, the thermal paste between the processor and heatsink has dried out, or a fan bearing is failing.
This one matters more than it feels like it should. Sustained heat degrades the processor, the graphics chip and the motherboard permanently, and it will also throttle performance — so the machine gets slower as it gets hotter. A cooling service is cheap. A replacement motherboard usually is not worth doing.
3. Random crashes, freezes or blue screens
An occasional blue screen after a driver update is normal enough. A pattern of them is a hardware signal, most often failing RAM, an unstable graphics card, an overheating processor or — again — a dying drive.
The error code shown on the blue screen genuinely narrows it down, so photograph it if you
can. WHEA_UNCORRECTABLE_ERROR points at hardware;
CRITICAL_PROCESS_DIED more often points at the drive or corrupted system
files. Either way, a memory test and a drive health check will identify it in under an
hour.
4. Popups, redirects, or programs you did not install
If your browser opens to a search engine you did not choose, redirects to sites you did not click, or you notice programs you do not recognise, the machine has picked something up. That ranges from irritating adware to credential-stealing malware.
The part people underestimate: some of this quietly harvests saved passwords and banking sessions in the background while looking like nothing more than an annoying toolbar. If you have online banking or saved passwords on that machine, treat it as urgent rather than as a nuisance.
5. Screen flickering, lines, or dead patches
Vertical or horizontal lines, flickering that changes when you move the lid, or dark patches that do not go away are display hardware problems — the panel itself, the ribbon cable, or the graphics chip.
An easy test: connect an external monitor. If the external display is perfect, the problem is the panel or its cable, which is a straightforward repair. If the external display shows the same fault, it is the graphics hardware, which is a bigger conversation.
When it is genuinely time to replace it
We will tell you when repairing is not the sensible option. Broadly, replacement makes more sense when the motherboard has failed on a machine over five years old, when the repair cost approaches half the price of an equivalent new machine, or when the hardware cannot run software you actually need.
Everything else — drives, RAM, batteries, screens, keyboards, cooling — is usually worth fixing. Those are the parts designed to be replaceable, and replacing one is almost always cheaper and less disruptive than starting over with a new machine and migrating everything.
The short version
- Slow boot, especially getting worse over weeks — check the drive urgently.
- Running hot or loud — get it cleaned before it damages something.
- Repeated crashes — photograph the error code and get it tested.
- Popups or unknown programs — treat as urgent if you bank on that machine.
- Screen faults — test an external monitor to narrow it down first.
If more than one of these is happening at once, that is the point to stop putting it off. Diagnostics are free, so finding out what is actually wrong costs you nothing.