The battery port, cover and all that is fine. It's the screen that needs to be replaced. One of the microthin lines that makes the screen work has gone black. It should be orange.
If I can buy a replacement screen I would, but i may just be buying another used gba.

Yuko, could the circuit trace be rejoined with one of these?
CAIG CircuitWriter Pen @ Radio Shack - $20Same CAIG CircuitWriter Pen @ Frys.com - $12.99CONDUCTIVE TRACE PEN @ Electronix.com - $21.99You would probably have to scratch off the plastic coating with a needle or push-pin. Depending on how wide the trace is though, it might work.
Cars also have certain parts that are intended to be replaced. Filters, belts, tires, brakes all wear out over time and are meant to be removed and replaced. So I didn't get a new car every time I changed my oil. OR DID I?
Not sure about that, but I run synthetic oil in my (now old) red coupe, and it rocks. In winter, it starts up like dirty regular oil in summer (i.e. less engine lag), and heats up alot quicker.
If you have that kind of money, can I have some so I can fix my Red Comet?
Sorry if I've mislead you Char, but most of these upgrades were done on the cheap (except for the GeF 7600GT, a little over $100, but was supposed to have 2 rebates, not 1. Darn Zipzoomfly.com...). If I remember it right, I think the CPU was ~$100, the HDD and mobo were each about half that, I got the DVD burner used off a buddy of mine for $20, and the 500W power supply was $0 ($28 w/ $28 rebate). Yeah, PS is cheap, but OK. Kept the 17" Trini used in my 2001 build...
My 2001 build cost me $1000+ at the time. (Would have been almost $1000 even, but for the new DVD-ROM, from a computer show, that turned out to be an unmarked refurbished drive and nonfunctional to boot. Even the replacement refurbished DVD didn't work. So I gave up, and shelled out money for another generic brand - $30+, but at least it worked. However, my 2007-2008 build ended up ~$400. At the time, my dad had suggested I buy a new PC for $400 rather than upgrade, so I researched what upgrades $400 would buy. Suffice it to say, my 2007-2008 build could blow the doors off that $400 new PC...

UPDATE 12/20/2010: Here is a link to a user that has fixed a ribbon cable with a circuit pen:
Self Trained Computer Wizkid: How to repair broken ribbon cable