How can I fix horizontal lines on my Toshiba laptop screen?

I have a Toshiba Satellite A45S1202 laptop, and a few days ago, horizontal lines appeared on my screen. The guy at Staples said I need a new screen. But now the lines are gone and the screen is fine. Does anyone know a simple fix for this problem without replacing the screen? Now that this has happened once, is... show more I have a Toshiba Satellite A45S1202 laptop, and a few days ago, horizontal lines appeared on my screen. The guy at Staples said I need a new screen. But now the lines are gone and the screen is fine. Does anyone know a simple fix for this problem without replacing the screen? Now that this has happened once, is my screen about to go completely out, or do I have some time before it does? Any troubleshooting help you have would be appreciated! Thanks!
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