CompuServe Messages

Here I am needing help again! Last night the mouse port on my NEW (less than 2 months old) 2000 decided to give up on me! I was playing Clown-OMania and when I rebooted to get out of the game the mouse was gone. Well most of it anyway. The buttons on the mouse still funtion but the X/Y rollers have no effect now. I've been improvising using the keyboard equivalents but it's a pain. Does anyone out there have an idea as to what might have died? I'd guess a chip somewhere went away but all other functions on the machine are fine. What chip could get stomped and leave all else running? The other 9 pin port is just fine, I tried out a joystick in it and it works great! I've found on the schematics a chip (74LS157) which most of the mouse signals go through. There are of course other signals but they go to things like Denise or Paula and I thought the machine had diagnostics to tell us if one of the custom chips died! Anyway, any and all help would be greatly appreciated. My dealer tries very hard but he has a heck of a time dealing with Commodore! I used to know one tech in town who was very good with Amigas. He of course left! Thanks in advance to any help you folks might be able to offer! Keith P.S. This things a real pain to use the keyboard equivalents to move the mouse pointer, I don't recommend it!