Light blue lines all over the screen & if I need to buy new...?

I am taking my Powerbook G4 to our Mac store on Monday. I use it with a Viewsonic monitor, and yesterday, there were suddenly faint offset blue lines on the whole screen. You can really see it where it used to be white. So set up the monitor to a different computer and it was fine. It is the computer. Maybe the screen? Or maybe a graphics chip? I really don't know how that works.
Any ideas what it might be?
My second question would be. This laptop is 4-1/2 years old. I use it all day long as I sell on ebay and etsy. The main things that I do are email, photo editing, and some games that I download from Bigfish, such as Ravenhurst.
Would I be good going with a Mac Mini since I already have a monitor and just bought a new keyboard about a week ago? Or the smaller Imac. I am on very limited space and even the smaller Imac will crowd my cubbie area a bit, it would not fit under my lowest shelf.
Thank you for any help you can offer.

My current Powerbook is Processor 1.67 GHz
Memory 1GB DDR2 SDRAM

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Light blue lines all over the screen & if I need to buy new...?

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