How to Fix Graphics Card Artifacting and Visual Glitches

Published 2026-10-16 · LuxuriousComputers Repair

Your screen is showing things that should not be there — colored lines, blocky textures, flickering polygons, random colored dots, or screen-wide corruption. These visual artifacts indicate your graphics card (GPU) is producing incorrect output. The cause can range from a simple software issue to a dying GPU, and the troubleshooting path depends on what type of artifacts you are seeing and when they appear.

Types of artifacts and what they mean

Screen-wide artifacts on the desktop

Colored lines, static, or corruption visible everywhere — on the desktop, in browsers, in every application. This type of artifacting suggests a fundamental problem with the GPU's video output, VRAM, or the connection between the GPU and the display. It appears regardless of what the GPU is doing because even drawing a simple desktop uses the GPU.

Artifacts only in games or 3D applications

Flickering textures, missing geometry, polygons stretching to infinity, or colored blocks that appear only when the GPU is under load (gaming, 3D rendering, video editing). The desktop looks fine. This suggests the GPU is partially functional but fails when stressed — overheating, insufficient power delivery, or VRAM errors that only manifest when VRAM usage is high.

Artifacts after waking from sleep

Screen corruption that appears after the computer wakes from sleep but clears after a restart. This is almost always a driver issue — the GPU driver is not properly reinitializing the display after the power state change. Update the driver or change the power management settings.

Software fixes

Update GPU drivers

Outdated or corrupt GPU drivers are the most common software cause of artifacts. A clean driver installation often resolves the issue:

1. Download the latest driver from NVIDIA (nvidia.com/drivers) or AMD (amd.com/en/support) for your specific GPU model
2. Download Display Driver Uninstaller (DDU) — a free tool that completely removes all GPU driver files. Standard uninstallation leaves remnants that can cause issues
3. Boot into Safe Mode (restart, hold Shift, select Troubleshoot, Advanced Options, Startup Settings, Safe Mode)
4. Run DDU in Safe Mode. Select your GPU manufacturer and click Clean and Restart
5. After the computer restarts, install the freshly downloaded driver

If the artifacts started after a recent driver update, try installing the previous driver version instead of the latest one. New drivers occasionally introduce regressions for specific GPU models.

Check for overclocking

If the GPU or VRAM has been overclocked (using tools like MSI Afterburner, EVGA Precision, or the manufacturer's software), the overclock may be unstable. Artifacting under load is the classic sign of an unstable GPU overclock — the GPU is being pushed beyond what it can reliably handle:

• Reset the GPU clocks to default. In MSI Afterburner, click the reset button to return to stock speeds
• If you did not overclock manually, check if the GPU came with a factory overclock. Some manufacturer models (like EVGA FTW, ASUS Strix OC, MSI Gaming X) have factory overclocks that can occasionally be unstable, especially as the card ages. You can underclock slightly below the factory OC speed to test stability

Roll back a Windows update

Windows updates can replace GPU drivers with generic Microsoft drivers or change display settings. If artifacts appeared right after a Windows update:

• Settings, Windows Update, Update History, Uninstall Updates — remove the most recent update
• Check Device Manager, Display Adapters — make sure the GPU is showing with the NVIDIA or AMD driver, not the Microsoft Basic Display Adapter

Hardware diagnosis

Check GPU temperature

Overheating is the most common hardware-related cause of artifacts that appear only under load. When a GPU overheats, it starts making errors in its calculations, producing visual artifacts. Check the temperature using GPU-Z, HWiNFO, or MSI Afterburner:

• Normal gaming temperature: 65 to 85 degrees Celsius depending on the GPU model and cooler design
• Concern: Above 90 degrees Celsius consistently
• Critical: Above 100 degrees Celsius — the GPU will throttle heavily and may artifact or shut down

If the GPU is overheating:

• Clean the GPU fans and heatsink. Compressed air to remove dust buildup. A GPU covered in dust runs significantly hotter
• Check that all fans are spinning. One dead fan on a dual or triple fan cooler can push temperatures into the danger zone. Fans can fail silently
• Replace thermal paste. The thermal paste between the GPU chip and the heatsink dries out over 3 to 5 years. Dried paste transfers heat poorly, causing overheating. This requires removing the GPU cooler, cleaning old paste with isopropyl alcohol, and applying new paste. This is not difficult but requires care
• Improve case airflow. Make sure the case has intake and exhaust fans, cables are managed to not block airflow, and the GPU has space to breathe

Test the display cable and port

A failing display cable or a damaged port on the GPU can cause artifacts that mimic GPU failure:

• Try a different cable (swap HDMI for DisplayPort or vice versa)
• Try a different port on the GPU — most GPUs have multiple output ports
• Try a different monitor to rule out monitor-side issues

DisplayPort cables in particular can cause artifacts if the cable is low quality and cannot maintain the bandwidth required for high resolution and refresh rate. Try a known-good high-quality cable.

Reseat the GPU

Power off the computer, unplug it, open the case, remove the GPU from the PCIe slot, and reinstall it firmly. A GPU that is not fully seated in the PCIe slot has a poor electrical connection that can cause intermittent artifacts. While the GPU is out, check the PCIe slot for debris and check the GPU's gold contacts for corrosion.

Check power connections

Mid-range and high-end GPUs require dedicated power cables from the power supply (6-pin, 8-pin, or 12-pin connectors). A loose power connector causes the GPU to receive insufficient power under load, which manifests as artifacts, crashes, or black screens during gaming. Push the power connectors firmly into the GPU until they click. Use separate cables from the power supply rather than daisy-chaining one cable for dual connectors.

Test VRAM

Faulty VRAM (the memory on the graphics card) causes artifacts that worsen as VRAM usage increases — larger textures, higher resolutions, and more complex scenes trigger more corruption. You can test VRAM using:

• OCCT (free): Run the VRAM test. It fills VRAM with patterns and checks for errors. Any errors indicate failing VRAM
• FurMark: A GPU stress test. While not a VRAM-specific test, it pushes both the GPU core and VRAM hard. If artifacts appear during FurMark within minutes, the GPU or VRAM has a problem

When the GPU is dying

If you have ruled out software, overheating, cables, and power — the GPU itself is failing. GPUs can fail from:

• VRAM degradation: Memory chips develop defective cells over time. Artifacting from VRAM failure typically worsens over weeks to months
• Solder joint fatigue: The solder connecting the GPU chip to the circuit board can develop micro-cracks from repeated thermal cycling (heating up during use, cooling down when idle). Symptoms are often intermittent — artifacts come and go, sometimes disappearing for days
• Power delivery failure: The voltage regulation circuitry on the GPU board can fail, causing the GPU core or VRAM to receive incorrect voltages

A GPU with confirmed VRAM errors or persistent artifacts despite clean drivers, good temperatures, and solid connections needs to be replaced.

GPU repair and replacement help in Marion

If your computer is showing visual artifacts and you are not sure whether the issue is the GPU, drivers, cables, or something else, LuxuriousComputers in Marion can diagnose the exact cause, test the GPU and VRAM, check temperatures and power delivery, and determine whether a driver fix, maintenance (cleaning and repasting), or GPU replacement is needed.