
Open OnyX, and type your administrator password.

Click the Verifying icon, then select the Structure of volume tab.

Click the Check button to immediately verify the startup volume.
You can use OnyX to verify the structure of the system files on the startup volume and to provide the option of running this verification upon opening OnyX.
Warning: During the verification process, the Finder can become slow or unresponsive. The wait cursor (which looks like a colored pinwheel) can show up, or your computer can appear to be unresponsive. This is normal, so wait for the verification to finish.
Important: This verification option is only possible if the hard disk is journaled.
Open OnyX, and type your administrator password.
Click the Verifying icon, then select the Structure of volume tab.
Click the Check button to immediately verify the startup volume.
By default, OnyX asks whether you want to check the structure of the startup volume when OnyX opens. You can choose to automatically check it or to do nothing by selecting the corresponding option in the Advanced tab of the OnyX Preferences pane.