Purpose: This tool helps distinguish between a faulty laptop screen and a failing GPU.
Screen faults and GPU faults produce similar symptoms but require very different repairs. Connect to an external monitor: if it works normally, the fault is in the laptop screen. If the external also shows problems, the GPU is likely at fault.
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Even a positive result benefits from preventive maintenance. Check related guides below.
Many minor faults have DIY fixes. Our guides walk you through each option clearly.
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π Book RepairYour result points to either a manageable issue you can address yourself, or a fault that needs professional attention before it gets worse.
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Visible cracks or impact damage β the display itself needs replacement regardless of other symptoms.
Artefacts, random colours, or distortion visible on an external monitor confirm a GPU fault rather than the screen.
Display problems that appear only in Windows (not the BIOS) and disappear in Safe Mode are usually driver-related.
Dim display or image only visible with torch = backlight. Works at certain hinge angles = cable. Both cheaper than a full screen replacement.
You can try: connecting to an external monitor via HDMI to isolate whether the fault is in the screen or GPU; booting into Safe Mode to rule out drivers; rolling back GPU drivers in Device Manager.
You need professional repair if: the external monitor shows the same corruption (GPU hardware fault); the screen has physical damage; or driver reinstalls haven't resolved the issue after a clean install.
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