![]() ![]() In the Installer, click Utilities, and then click Restart. Insert the Mac OS X installation disc into your computer’s optical drive (or an optical drive connected to your computer), and then double-click the Install Mac OS X icon. Here are instructions copied straight from To erase and reinstall Mac OS X Snow Leopard: Therefore I would sell it with Snow Leopard preinstalled. Sometimes the solution is as simple as force closing apps that are hogging resources in the background or otherwise causing your MacBook to freeze.You can reinstall like cablesm suggested and it will have Lion installed but you have to understand that you do NOT sell Lion with it unless you have a bought Lion USB Stick cause Lion is hard bundled with YOUR AppleID and you can not sell it or move it to another AppleID! If your MacBook is freezing up all the time, you update your applications via the App Store, update your Mac’s software, or investigate other potential solutions. You may even want to get in touch with Apple support. If your MacBook is frequently locking up, you’ll want to check out our guide to fixing common macOS problems. You shouldn’t have to force restart your MacBook regularly as it can make you lose your work. If you can’t find anything wrong, you’ll want to get in contact with Apple customer support. ![]() If force restarting doesn’t help alleviate the lockups and freezes, you should try charging your MacBook for up to an hour and/or rebooting it into Diagnostics Mode to see if the issue is hardware-related.Once your computer reboots, you’ll need to sign back into your account.Hold these keys down until your MacBook’s screen goes blank and the computer restarts itself.To force a restart your MacBook, you need to press and hold down the Command (⌘) button, the Control (Ctrl) key, and the power button at the same time.If your MacBook Air or MacBook Pro stops responding, here’s how to force restart it: If you own an older MacBook with an optical drive, the key doubles as the Eject button. On MacBook models with physical F1-F12 keys, it’s located in the upper right-hand corner. ![]()
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