Question:

What are the possible causes and solutions for a macbook pro that displays a grey screen with vertical lines on booting and does not allow login on an external monitor?

I have a macbook pro that was working normally until yesterday, but today it shows a grey screen with vertical lines when I turn it on. I can hear the startup sound, but the screen does not change. I tried connecting it to an external monitor via HDMI, but it only shows the lock screen and does not let me enter my password. The macbook pro still shows the grey screen with lines. I have not dropped or damaged the device in any way. How can I fix this problem?

Answer:

If you have a macbook pro that shows a grey screen with vertical lines when you turn it on, you might be experiencing a hardware or software issue that prevents your device from booting properly. This problem can be frustrating and alarming, especially if you have important data on your macbook pro that you need to access. Fortunately, there are some steps you can take to try to fix this problem or at least diagnose its cause.

Possible causes of the grey screen with vertical lines

There are several possible causes of the grey screen with vertical lines on your macbook pro, such as:

• Overheating: If your macbook pro gets too hot, it might cause some components to malfunction or damage the display. Overheating can be caused by insufficient ventilation, dust accumulation, faulty fans, or intensive tasks that strain the CPU or GPU.
• Display damage: If your macbook pro has been dropped, bumped, or exposed to liquid, it might have damaged the display or the cables that connect it to the logic board. This can result in distorted or corrupted images, lines, or colors on the screen.
• Logic board failure: The logic board is the main circuit board that controls all the functions of your macbook pro. If the logic board fails, it might prevent your device from booting or displaying anything on the screen. Logic board failure can be caused by physical damage, power surges, or defective components.
• Software corruption: Sometimes, the software that runs your macbook pro might get corrupted due to viruses, malware, incompatible updates, or disk errors. This can cause your device to freeze, crash, or show a grey screen with vertical lines on booting.

Possible solutions for the grey screen with vertical lines

Depending on the cause of the problem, there are different solutions that you can try to fix the grey screen with vertical lines on your macbook pro, such as:

• Use additional cooling: If your macbook pro is overheating, you might want to use a reliable fan control software to increase the airflow and reduce the temperature of your device. You can also use a cooling pad, a laptop stand, or a clean cloth to elevate your macbook pro and improve the ventilation.
• Try using an external display: If you suspect that your macbook pro has a display damage, you can try connecting it to an external monitor or a TV using an HDMI cable or a wireless connection. This can help you determine if the problem is with the display or the logic board. If the external display shows a normal image, then your macbook pro’s display is likely damaged and needs to be replaced. If the external display shows the same grey screen with vertical lines, then your macbook pro’s logic board is likely faulty and needs to be repaired .
• Reset SMC and NVRAM: If your macbook pro has a logic board failure or a software corruption, you can try resetting the System Management Controller (SMC) and the Non-Volatile Random-Access Memory (NVRAM). These are two components that control various settings and functions of your device, such as the power, the display, the sound, and the startup. Resetting them can sometimes resolve issues that prevent your macbook pro from booting or displaying properly .
• Reinstall macOS: If none of the above solutions work, you might want to reinstall the operating system of your macbook pro. This can help you fix any software corruption that causes the grey screen with vertical lines on booting. However, before you do this, you should back up your data using an external hard drive or a cloud service, as reinstalling macOS will erase everything on your macbook pro. To reinstall macOS, you need to boot your device into Recovery Mode by holding down the Command and R keys while turning it on. Then, you need to follow the on-screen instructions to erase your disk and install a fresh copy of macOS .

Conclusion

The

grey screen with vertical lines on your macbook pro can be caused by various hardware or software issues that prevent your device from booting or displaying properly. To fix this problem, you can try using additional cooling, using an external display, resetting SMC and NVRAM, or reinstalling macOS. However, if none of these solutions work, or if you are not comfortable performing them yourself, you should contact Apple Support or visit an Apple Store or an authorized service provider for professional help.