HT201177 I have a horizontal line in the bottom 1/3 of my screen display that I can't get rid of

I can't seem to get rid of this black horizontal line in the bottom 1/3 of my display its there in all applications and there appears to be a shadow bar behind it? any help would be appreciated

What model iMac? This forum covers three different variants made before 2006. They have different display technologies.
Doing "About this Mac" from your Apple menu and posting the info found there for your processor type is a good start. If that shows you have an Intel processor, those iMacs are different enough to have a separate forum here:
iMac (Intel)

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