My laptop screen randomly has black bars with grey squares like a pattern on a certain side of the laptop and then when I move my mouse it vanishes? How can I fix this?

 The appearance of black bars and grey squares on your laptop screen that disappear when you move the mouse could be due to various reasons, some of which might be related to the hardware or software. Here are some troubleshooting steps you can try:

1. Update Graphics Drivers: Outdated or corrupt graphics drivers can cause display issues. Try updating your graphics drivers to the latest version from the manufacturer's website.

2. Check for Software Issues: Sometimes, software conflicts or glitches can cause display anomalies. Restart your laptop and see if the issue persists. If it's related to a particular application, try updating or reinstalling it.

3. External Devices: Disconnect any external devices (monitors, USB devices, etc.) connected to your laptop. Sometimes, these devices can cause display irregularities.

4. Run Hardware Diagnostics: Many laptops have built-in diagnostics tools that can check for hardware issues. Use these tools to test the display and other hardware components.

5. Adjust Display Settings: Try adjusting the display settings, such as resolution and refresh rate, to see if it makes a difference.

6. Check for Physical Damage: Inspect the screen for any physical damage, like cracks or pressure marks. Sometimes, physical damage to the screen can cause irregularities.

If none of these steps resolve the issue, it might indicate a hardware problem with the screen or graphics card. In that case, contacting the laptop manufacturer's support or taking it to a qualified technician for inspection and repair might be necessary