Lines across the picture on screen after picture taken.

CCD (Charge Coupled Device): one of the two main types of image sensors used in digital cameras.

Some symptoms of a defective CCD include distorted images or abnormal colors, scratchy purple lines, blank or black pictures, and/or black videos with good sound being recorded on the camera's flash card. A CCD problem would explain the lines on your pictures and the lines on the LCD (since the CCD is used to feed the live image).

When a picture is taken, the CCD is struck by light coming through the camera's lens. Each of the thousands or millions of tiny pixels that make up the CCD convert this light into electrons. The number of electrons, usually described as the pixel's accumulated charge, is measured, then converted to a digital value. This last step occurs outside the CCD, in a camera component called an analog-to-digital converter.

If seen on both your pc monitor as well as the camera's LCD then it's likely a CCD issue and it's no wonder that it will be more expensive than buying a new digicam. This is why you need to be exceptionally careful when taking care of your camera since most are uber sensitive to being damaged by the slightest miss-handling.

In order to correct this issue, the repair facility needs to replace the CCD. This is not something you may do on your own; check this article for additional details: Bad CCDs

Hope helps.