Blog
Tests
Guides for testing your keyboard, mouse, screen, sound, network and other hardware, and for fixing what the tests find.
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Tests
Why a USB-C dock changes monitor scaling
Find out why a USB-C dock changes monitor scaling, compare each screen's resolution and scale, then restore readable text on Windows or Mac.
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Tests
What charging tests can't tell you about electrical safety
Learn what a browser charging test can measure, what it cannot prove about electrical safety, and when to stop using a charger or cable.
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Tests
How to compare warm and cool monitor settings
Compare warm and cool monitor color settings with the same test patterns, then choose a white point that looks comfortable without hiding color problems.
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Tests
Display problems after waking from sleep: how to check
Check whether a black screen, flicker, wrong resolution, or missing monitor after sleep comes from display settings, a cable, or the panel.
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Tests
How to check if a monitor is connected at the right size
Check the resolution and scaling reported for each display, then compare them with your monitor's settings to spot a wrong mode or connection.
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Tests
Extend vs. duplicate screen: what changes?
Learn what extend and duplicate do, how each mode changes your desktop, and how to choose the right display setup on Windows 11 or Mac.
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Tests
Remote desktop shows the wrong screen dimensions
Find out whether the remote session or your display settings are causing the wrong size, then fix resolution, scaling, or multi-monitor setup.
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Tests
How to check a display after changing HDMI cables
Check resolution, refresh rate, colors, and dropouts after an HDMI cable change, then narrow down whether the cable, port, or display setting is at fault.
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Tests
How to compare a monitor's picture in full-screen mode
Compare the same colors and gray tones across monitors in full-screen mode, then check the settings that can make one display look different.
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Tests
Desktop fan spinning backward? What to inspect
Learn how to tell whether a desktop fan is really spinning backward, check airflow and orientation, and decide when to stop testing or replace it.
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Tests
Why a laptop gets hot when the lid is closed
Learn why a closed laptop lid can change cooling, how to compare behavior safely, and what to check before using an external display.
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Tests
How to test a PC before using it in a warm workshop
Check whether a PC slows down under load in a warm workshop, how to run a safe browser test, and what the results can and cannot tell you.