If you are a Mac user, chances are you have experienced a gray screen at startup at least once. This can be a frustrating and anxiety-inducing experience, especially if you rely on your Mac for work or personal use. The good news is that there are several steps you can take to fix a Mac that stalls on a gray screen at startup.

Step 1: Disconnect External Devices

One of the most common causes of a gray screen at startup is an external device, such as an external hard drive or USB device, preventing your Mac from booting up properly. To fix this issue, simply disconnect all external devices from your Mac and try restarting it again. If your Mac starts up normally, one of the external devices was likely causing the issue and you can then reconnect them one by one to identify which one was the problem.

Step 2: Boot in Safe Mode

If disconnecting external devices did not fix the gray screen issue, the next step is to boot your Mac in Safe Mode. This mode starts up your Mac with only the essential system files and drivers, which can help identify and fix any software conflicts that may be causing the problem. To boot in Safe Mode, hold down the Shift key while your Mac is starting up. Once it has finished booting in Safe Mode, restart your Mac normally to see if the issue has been resolved.

Step 3: Reset NVRAM and PRAM

If your Mac is still stalling on the gray screen at startup, the next step is to reset the NVRAM and PRAM. These are small pieces of memory that store settings related to your Mac’s performance and startup, and resetting them can often fix issues such as the gray screen. To reset the NVRAM and PRAM, shut down your Mac and hold down the Command+Option+P+R keys while restarting your Mac. Keep holding down the keys until you hear the startup chime twice, then release them and let your Mac start up normally.

Step 4: Reinstall macOS

If none of the above steps have fixed the gray screen issue, the next step is to reinstall macOS. This will overwrite all system files and drivers, potentially fixing any software conflicts or corruption that may be causing the problem. To reinstall macOS, restart your Mac and hold down the Command+R keys. This will start up your Mac in Recovery mode, from which you can select the option to reinstall macOS.

In conclusion, a gray screen at startup can be a frustrating experience for any Mac user. However, by following these steps, you can identify and fix the issue, restoring your Mac to normal operation once again. If none of these steps resolve the issue, it may be time to consult with a professional Mac technician or Apple support team to further diagnose and fix the problem.