flashing desktop iMac computer

10.11.6 OSx
iMac 24 inch mid-2007
ATI Radeon HD 2600 Pro 256 MB

This afternoon there was a close call of thunder/lightning. I didn't know the brief storm coming, but the computer worked always fine afterwards. I stopped it immediately.

Flashes when I restarted the desktop computer. Nothing I've done has stopped - mainly just restart and run Disk Doctor (for lack of other ideas).

Windows Flash not, than the office. I can't up the launch bar and I can't change between desktops and split screen does not work.

Any ideas please?

Repair the disk for El Capitan

  1. Restart the computer and after the chime hold down the command and R until the Utility Menu appears.
  2. Disk utility and click on the continue button.
  3. Then select layouts withdrawal (usually Macintosh HD) entry of the volume of the list to one side.
  4. Click the first aid tab on the toolbar and wait for the fact button to activate. Click it, and then quit disk utility.
  5. Select restart from the Apple menu.

If the above does not help, then follow these steps:

Reinstall El Capitan without erasing the drive

Please make sure that you back up.

  1. Restart the computer. Immediately after that the chime hold down the command and R until the Utility Menu appears.
  2. Select disk utility, then click on the continue button.
  3. Select the withdrawal (usually Macintosh HD) entry of the volume of the list to one side.
  4. Click first aid icon in the toolbar. Wait until the button is active, then click it.
  5. Quit disk utility and re-enter the Utility Menu.
  6. Select Reinstall OS X and click on the continue button.

Tags: Mac

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