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Kestro

Kestro Knowledge

Knowledge for business IT

We make our money sourcing and preparing equipment, not hoarding knowledge. This is what we would have told you if you had phoned.

guides
8
topics
4
last updated
31 Aug 2026

Topics

0104

Lifecycle and replacement

When a machine has done its job, what support dates mean for a fleet, and how to replace without replacing everything.

  1. SECURITY UPDATESStop on the dateTHE MACHINE RUNS ONWithout new fixes07LIFECYCLEPLANPRIORITISEREPLACE IN STAGESSUPPORT ENDSTHE MACHINE DOES NOT

    Windows 10 support has ended — what now?

    The machines do not stop working — but the security updates have stopped. How to work out what happens to which.

    7 min
    Read the guide
  2. A laptop suspended between two streams of light: spare parts to the left, another machine to the right.

    Repair or replace? How to work it out

    The calculation that decides whether a slow or broken machine gets repaired or replaced.

    4 min
    Read the guide
  3. A chip floating before a gateway of light, as the question of whether an older machine passes or not.

    Windows 11 on an older machine: what does it take?

    Why a working machine is suddenly not allowed to update — and what the options are.

    4 min
    Read the guide

0204

Buying, condition and disposal

What to look for before buying used — and what has to happen to the equipment when it moves on.

  1. Two identical laptops side by side: one dulled and tired, the other with light along every edge.

    Refurbished or used: what is the difference?

    Two words used interchangeably, and a difference that decides what you get. How to find out what was actually done to the machine.

    8 min
    Read the guide
  2. SCREENTesting …KEYBOARDTesting …PORTSTesting …BATTERYTesting …STORAGETesting …CHASSISTesting …03INSPECTIONQUALITYCONTROLIN EVERY DETAILTHIS IS HOW YOUCHECK A MACHINE

    Ten things to check on a used laptop before you buy

    A ten-minute check that reveals what the seller left out of the listing.

    5 min
    Read the guide
  3. An NVMe drive whose trailing edge dissolves into luminous particles while its leading edge stays sharp.

    How to erase data before selling or scrapping a computer

    Formatting is not erasing. The difference gets expensive if it is a company machine.

    4 min
    Read the guide

0304

Memory and storage

Memory and storage: how much is needed, what can be upgraded, and when it is worth doing.

  1. MEMORYModule going inSLOTContact madeSEATEDReady to use02PERFORMANCESMALL UPGRADESBIG DIFFERENCESFASTERMORE ROOMREADY FOR MORE

    How to upgrade the memory in a laptop

    The cheapest upgrade there is — if the machine can take it at all.

    5 min
    Read the guide

0404

Other guides

Outside the clusters. They stay, but nothing is built on top of them.

  1. An open PC chassis with its components floating around it, each tied to its own slot by a thread of light.

    How to build your own PC

    The order, the parts that must match, and the mistakes everyone makes first time.

    6 min
    Read the guide

Free advice

If you have a specific question none of the guides answers, write to us. We answer questions about repairs, upgrades and buying used equipment without sending an invoice — including when the answer is that you should not buy anything from us.

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The people you will be talking to

Ismail Masoumabadi, Network Security & International Sales Management

Ismail Masoumabadi

Network Security & International Sales Management

Mehdi, Sales Advisory & Head of Marketing and Sales

Mehdi

Sales Advisory & Head of Marketing and Sales

Meet us