Basic PC maintenance that most people ignore

Dust: your equipment's number one enemy

Dust isn't just aesthetic. It acts as a thermal insulator that prevents heat from dissipating correctly. When the processor cannot cool down, the operating system activates thermal throttling: it automatically reduces the processor speed to lower the temperature. The visible result is a computer that runs slow for no apparent reason.

In extreme cases, sustained high temperatures shorten the life of the CPU, GPU, and motherboard capacitors. A computer that should last 8-10 years can fail in 4 if it always works at 90 °C. Common symptoms are sudden shutdowns (the equipment turns itself off before burning), fans that sound like a jet turbine, and performance that plummets after 15-20 minutes of intensive use.

How to clean correctly

You don't need to be a technician to do a basic cleaning. The material you need: compressed air spray (at any computer store, about $5-8), a Phillips screwdriver to open the side of the tower, and optionally a soft-bristled brush to loosen packed dust.

• Turn off the equipment completely and unplug it from the power.
• Take it to a well-ventilated space or, even better, outside. Devoloping dust is considerable.
• With the compressed air spray, blow in short bursts on the fans, the processor heatsink, and the air intake and outlet grilles.
• Hold the fans with a finger while blowing them to prevent them from spinning at high speed without lubricant, which can damage the bearings.
• Clean the dust filters if your case has them — they are usually thin plastic and are washed with water.

Recommended frequency: every 6-12 months for normal environments. Every 3-4 months if you have pets, if you smoke in the room, or if the equipment is on the floor instead of on a table.

Thermal paste: what nobody tells you

Thermal paste is a compound applied between the processor and its heatsink to improve heat transfer. From the factory, all equipment comes with paste, but over time it dries out, shrinks, and loses conductivity. On a 4-5 year old computer with the original paste, the temperature difference between before and after changing it can be 10 to 20 °C. That's the difference between constant throttling and full performance.

Signs that the paste is dry

• CPU temperatures above 85 °C at idle or above 95 °C under load.
• The computer turns itself off after several minutes of intensive use.
• The processor fan runs almost always at full speed.
• The equipment is more than 4-5 years old and has never had maintenance.

To apply new paste: remove the heatsink, clean the surface of the processor and the heatsink with 90% isopropyl alcohol and a swab, apply a drop the size of a grain of rice in the center of the processor and reassemble the heatsink. Don't spread it with your finger — the pressure of the heatsink distributes it itself.

Freeing up disk space: what to delete without fear

A disk that exceeds 85-90% of its capacity starts to slow down the system. In SSDs this affects write performance; in traditional HDDs, fragmentation and lack of free space combine to create a real bottleneck.

In Windows, you can safely delete these three types of files:

• System temporary files: open the Start menu, type %temp%, press Enter, and delete everything that appears. The system will not use anything in there.
• Windows Update cache: go to C:\Windows\SoftwareDistribution\Download and delete the contents (not the folder itself). Windows will re-download what it needs if there are pending updates.
• Disk cleanup with WinSxS: open the command prompt as administrator and run Dism.exe /Online /Cleanup-Image /StartComponentCleanup. This folder can take up several GB and stores old versions of system components that are no longer necessary.

It's also worth reviewing the Downloads folder, emptying the Recycle Bin, and uninstalling programs you don't use. Many computers have trial software, obsolete printer tools, or games that no one plays and occupy dozens of gigabytes.

Startup programs: the invisible drag

Every program that is installed tries to add itself to the Windows startup to "be available faster." The cumulative result is that the equipment takes 3-4 minutes to be ready when it should take 30 seconds. Open the Task Manager (Ctrl + Shift + Esc), go to the Startup tab and disable everything you don't need at startup: Spotify, Discord, OneDrive (if you don't use it actively), Skype, game clients, hardware manufacturer utilities that no one uses.

A good rule: if you don't remember what it's for, search for it on Google before disabling it. But in most cases, 70% of startup programs can be disabled without any consequence.

Basic backup: the 3-2-1 rule

Maintenance is not just about making the equipment work well — it's also about making sure you don't lose data when it fails. And when, not if. Mechanical hard drives have an average life of 3-5 years. SSDs last longer, but they also fail.

The 3-2-1 rule is the minimum standard for any serious backup:

• 3 copies of your data (the original + 2 copies).
• On 2 different types of media (for example, external hard drive + cloud).
• With 1 copy outside your physical location (against theft, fire, or flooding).

For home users, a practical and cheap solution: activate OneDrive or Google Drive for your important documents (automatic cloud copy) and connect an external hard drive once a month to make a complete copy. With that, you already meet the basic 3-2-1 rule.

When it's time to call a technician

There are signals that go beyond the maintenance you can do yourself and that indicate a hardware problem that requires professional diagnosis:

• The equipment doesn't start or gives beeps when turning on (POST error codes).
• Frequent blue screens with different error codes each time (may indicate faulty RAM or motherboard problem).
• The hard drive makes clicking or scratching noises — sign of imminent failure, act immediately.
• Visual artifacts on screen (lines, colored pixels, flickering) that don't disappear when restarting.
• The equipment restarts itself when starting without reaching the desktop.