Listings for second-hand computers and parts look tempting: a gaming tower for half price, an "almost new" laptop, a graphics card at 40% off. Many people do make great purchases on the used market. But we regularly hear from people who discovered a week after buying that the graphics card overheats, the drive is failing, or the laptop is locked to the previous owner's account. The difference between a bargain and wasted money is a thorough check before you pay.
Why people sell computers
The reasons can be entirely innocent: moving house, upgrading, no longer needing it after finishing studies. But sometimes it's sold precisely because something has started to fail: it restarts, overheats or the drive clicks. The seller may genuinely not know about the problem — or may choose not to mention it. A computer can seem perfectly fine when briefly switched on, with the fault appearing only under load or after half an hour.
The main risks
A worn drive
Hard drives and SSDs have a finite lifespan. A drive with reallocated sectors or an SSD that has used up its write endurance might last another year — or fail next week and take your data with it. You can't tell from appearance or a quick test; you need to read the SMART data.
A graphics card after mining or overheating
Cards that have run around the clock for years may have worn fans, dried-out thermal pads and degraded memory. Not every such card is bad, but they need especially careful testing under sustained load, monitoring temperatures and watching for artefacts. Reflashed cards sometimes masquerade as more powerful models.
Fake or substituted components
The listing names one processor, but a weaker one is installed. The graphics card is a fake with a modified BIOS that reports itself as an expensive model. The power supply has been swapped for a cheap no-name unit. There's less memory than advertised. Without checking, all of this is easy to miss.
Locked devices
Laptops — especially MacBooks — can be tied to the previous owner's or an organisation's account: activation lock, corporate management, a firmware password. These can't be removed without the owner, leaving you with a useless object. A locked device may also be stolen.
Malware and someone else's data
A computer sold "with the system and programs installed" may contain malware, remote-access software or pirated programs. Never use the previous owner's installation — always start with a clean install.
Signs of liquid damage or repair
A laptop that has had a spill may still work, but corrosion on the board keeps spreading and will cause a failure within a month or two. Solder marks, missing screws or broken warranty seals are reasons to ask questions.
What a technician checks before you buy
| Check | How |
|---|---|
| Components match the listing | Identifying the exact CPU, GPU, memory and drive models |
| Drive health | SMART data, power-on hours, reallocated sectors, SSD endurance |
| Stability under load | CPU and GPU stress tests with temperature monitoring |
| Laptop battery | Actual capacity versus design capacity, cycle count |
| Screen and ports | Dead pixels, backlight bleed, every port, camera and audio |
| Locks | Accounts, firmware passwords, corporate management |
| Internal condition | Signs of spills, overheating or repair, power supply quality |
Test the computer at the seller's before you pay, and don't accept "I'll switch it on, you'll see it works". A quick power-on reveals almost nothing: overheating, drive degradation and graphics instability only show up under load.
When second-hand makes sense
A used computer is a good deal when you know exactly what you're buying: an ex-corporate business desktop, a gaming PC from a careful owner with paperwork and receipts, or a laptop with warranty remaining. In such cases you can save 30–50% on the price of new. A good strategy is to buy the core — processor, motherboard, case — second-hand and fit a new drive and power supply, since those are the parts whose wear is hardest to judge and whose failure has the worst consequences.
After you buy
Even if the check goes well, a few things are worth doing afterwards: a clean operating system install, a dust clean and new thermal paste if it hasn't been serviced, and a check — or replacement — of the power supply. It's inexpensive and extends the life of your purchase.
A real example
A customer found a gaming PC at roughly half the market price and asked us to inspect it before buying. Ten minutes into the stress test the graphics card started producing artefacts, and monitoring revealed it had been reflashed and was actually a lower-tier model. The drive had hundreds of reallocated sectors. The customer walked away, and a week later we found another machine together — slightly more expensive, but completely sound.
It also helps to ask the seller for the original receipt or box: it confirms the model and ownership and sometimes reveals remaining warranty.
Let us inspect a computer before you buy
We travel across Tbilisi to inspect used computers and laptops, including evenings and weekends. Learn more on our computer diagnostics, laptop diagnostics and Windows installation pages.
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