If a plain white screen appears when your Mac starts, then some of its hardware or software may have failed. Follow the steps below to solve the problem.
1. Check your Mac’s hardware systematically.
Reboot into Safe Mode. This is quite easy; simply reboot into Safe Mode on the Mac with a properly.
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- The White 'Unibody' MacBook models ship, or shipped, with a version of Mac OS X 10.6 'Snow Leopard.' Specifically, the MacBook 'Core 2 Duo' 2.26 13' (White Polycarbonate Unibody/Late 2009) shipped with MacOS X 10.6.1, build number 10A2047. The current MacBook 'Core 2 Duo' 2.4 13' (Mid-2010) ships with Mac OS X 10.6.3, build number 10D2162.
To find a malfunctioning device attached to your Mac, start by disconnecting everything from it, including peripherals with a Bluetooth or other wireless connection. After you have done that, restart the Mac and see if the white screen reappears. If your Mac starts normally, then you can try reconnecting all of the devices one at a time until you find the one that caused of the problem. Replace that broken device.
If the instructions above did not solve the problem, proceed to the next step.
2. Start your Mac in Safe Mode and clean it up.
To start your Mac in Safe Mode, follow these instructions:
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If the Mac can start up successfully, use Cleaner One Pro to remove junk files (like app logs and caches), unneeded big files, and duplicates. The App Manager feature can completely uninstall any app with no leftover files.
If the instructions above did not solve the problem, proceed to the next step.
3. Reset the PRAM or NVRAM.
Parameter Random-Access Memory (PRAM) and Non-volatile Random-Access Memory (NVRAM) store configuration information about your Mac. To reset the PRAM/NVRAM, follow these instructions:
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If your Mac has multiple drives, you might need to select a start-up disk after resetting your Mac. If your Mac starts normally, then you can skip the instructions below. However, if you must select a start-up disk:
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After your Mac successfully starts, go to System Preferences and adjust any settings that changed.
If the instructions above did not solve the problem, proceed to the next step.
4. Make repairs with the Disk Utility.
A faulty hard drive can cause a white screen to appear. Use the Disk Utility to make repairs by following these instructions:
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![Mac Mac](/uploads/1/1/9/0/119021385/452209628.jpg)
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The Disk Utility will report the status of the drive after it has finished. If it indicates that the drive will soon fail, back up your files and then replace or reformat the faulty drive.
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If the instructions above did not solve the problem, proceed to the next step.
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5. Reinstall Mac OS X.
You should only try this solution if none of the previous steps have solved the problem. Reinstalling the operating system should fix any corrupted software without deleting your data and files, but you should back them up first if possible. When ready, follow these instructions:
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Once you have your Mac up and running again, install an optimizer app to keep it healthy. Cleaner One Pro can help prevent this problem from recurring by thoroughly cleaning junk files, removing duplicates, and highlighting large files. It also includes features like App Manager and Deep Uninstall to help remove unwanted apps completely. Cleaner One Pro even lets you monitor the performance of your Mac so you can discover any future problems before they become serious.