The images apprear purple on the screen, and dark in patches. New photo's taken, come out purple. But existing photo's appear on the screen as, normal.

Hi,

If the previously captured images are appearing fine in the Camera, then the issue is with the CCD Image Sensor unit only. Check if the display icons are appearing normally on the Camera screen.

Try power resetting and Factory resetting the Camera to check if the issue can be resolved:
Power reset:
Remove the batteries from the Camera.
Press and hold the POWER BUTTON of the Camera for 15 seconds.
Then, reinsert the batteries after 1 minute.
Factory reset;
To reset the Camera back to factory default, select the INITIALIZE Option from the Main Settings 1 Menu of the Camera to OK.

Home-->Settings-->Main Settings 1-->Initialize-->OK