Dark horizontal lines in the image

The picture shouldbe free of vertical or horizontal lines.

1. If the lines are present on the TV screen, press the SMARTbutton. on the remote control and select Settings> SUPPORT > Picture Test.
2. This menu will appear on the test picture. Select whichoption best describes the result you have.

https://www.lg.com/us/support/help-library/horizontal-or-vertical-lines-tv-CT10000020-1387209695776
A single set of horizontal lines could indicate damage, a graphics system failure, or loose internal video cables. Broken signals from cables or graphics hardware creates impurities in reproducing an image on an LCD screen, conditions that often manifest in the form of vertical or horizontal lines of color. https://itstillworks.com/causes-horizontal-lines-lcd-panel-37988.html

When having bright lights on a dark background, you can have horizontal lines. That is supposed to be normal. but the camera should give good pictures in bright light. Try setting the camera in automatic. most of the time it is the green camera loge on the mail dial.

See this FixYa link.

This implies that your monitor had gone bad. you need to take it to a computer repair shop.

your printer needs to be cleaned. Use the cleaning mode in windows printer HPOFFICEJET

i think the color wheel is in need of calibration.

buffer drivers could be it

Gimbo again. Think LCD damaged will need to repair. Pics. as normal when viewed or printed.
Why has nobody commented?
How much to replace screen? Any ideas?

This sounds like it might be a defective CCD imager. If so, Canon should fix this for you for free, including free shipping both ways. This is regardless of your camera's warranty status. Please check the following two links for more info:

http://camerarepair.blogspot.com/2007/11/canon-digital-cameras-showing-black.html

http://www.usa.canon.com/consumer/controller?act=PgComSmModDisplayAct&fcategoryid=225&modelid=13390&keycode=2112&id=29819

Applicable cameras include:
A40, A60, A70, A75, A80, A85, A95, A300, A310, S1 IS, S60, S200, S230, S330, S400, S410, S500, SD100, SD110, IXUS V2/300/400/430/500, IXY Digital 200a/300a/400/450/500

Mine had the same problem (except the stripes are horizontal).  I sent it to Canon and sure enough it is the CCD problem that many of these have.  The good news is that it is covered under a recall and Canon will fix it free, including the shipping.