Still turns on and works but the picture is black screen
My camera was working fine and then all of the sudden the images started all looking like squiggly vertical colored lines
If your camera can still take pictures OK even though you cannot view them in the LCD screen, but are OK when you download them to view, then most probably the LCD screen is faulty.
Here is a link to the Ifixit guide on how to replace your LCD screen.
Here is a link to just one supplier of the replacement part. This is just to give you an idea of the cost of the part. Just search online for others if this doesn't suit.
It seems as though the image sensor in the camera has either gone faulty or has a loose connection.
Here is a link to the Ifixit guide repair guide to get access to the sensor.
Here is a link to just one provider of the replacement part.