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the track ball on the curve is very prone to such problems. we frequently use un-clean fingers when using the track ball. the dirt gets collected on the track ball and on the underside. use an alcohol swab to clean the track ball and your problem should get solved.
Give this a shot- get out a couple of pages of computer printer paper, place the paper on a flat surface; lock the key pad on your curve. Place your blackberry face down on the paper and gently (don't press down) rub your phone up and down, back and forth a few times. Try your cursor now, believe it or not, this works pretty well (the paper gives enough resistance to make the track ball move). As long as there isn't a bigger issue with the track ball, this should solve your problem.
This is very common for the blackberry's. Sometimes the trackball gets full of lent and dirt which won't allow the wheels to move. The chrome ring around the ball just pops off and the track ball should come out. Try cleaning it with a small brush. If this doesn't fix the problem, then a new track ball can be purchased on ebay for less than $5
try cleaning the track ball with a qtip dipped in alcohol or nail polish remover.. It could be that the track ball isn't "reading" correctly due to oil, etc.
Depending on how comfortable you are with removing the trackball it's not hard to fix... you may have some dirt or grit interfering with the trackball and/or sensors. Take a small screwdriver or blade and gently pop the silver ring around the trackball off. This will free the actual trackball housing. Use an old toothbrush to clean everything. I also soaked the trackball in a little rubbing alcohol. Just make sure it is completely dry before reassembling. If that doesn't work you can purchase replacement trackballs from places like crackberry.com.
I found that removing the track ball and cleaning the contact and track ball with a cotton swab moistened with a small amount of isopropyl alcohol, it worked a 100 percent better when I returned the ball to the handset. DO NOT SATURATE THE BALL OR THE HANDSET WITH THE ALCOHOL!! ONLY USE A VERY SMALL AMOUNT!!!!
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