After this, click on Verify Disk Permissions and then on Repair Disk Permissions Click on Verify Disk and then, if asked to fix problems, on Repair Disk Once you see Desktop, start a Disk Utility scan to detect and repair file system errors (don't forget to choose your main hard drive) If this doesn't help, follow the instructions below: After your Mac boots up, restart it as you usually do. Release the Shift key when you see a grey Apple sign and the progress bar below this sign Right after you hear the startup tone, press and hold the Shift key Wait until your computer turns off and after that press the Power button Hi! Try these basic troubleshooting steps:
