Hi Ashlee,
Im Arthur. Do not use your real name on the internet:
( Advice: Avoid giving personal information (mail, telephone, etc ...).
About the red lines:
If you are on a LCD flat screen or a laptop,
There are chips that are both Horzontal ,and vertical amplifiers.
They amplify the digital signal from the video card.
They amplify the pixels for the red, green and blue pixels.
What the problem I think is that a Amplifier chip is bad, or its connections are bad.
on a Horzontial red pixel amplifier. ( for that screen region ).
On some Macintosh Powerbooks, all that is needed is some solder to fix,
you are either going to have to learn to live with it, or are going to
have to have it replaced. ( No one, fixes the chips anymore. )
What kind of display is it?
I can find you some cheap replacements.