Aaaargh! Damn!

I almost tried EVERYTHING I found on the net, but I can’t get ANY PS/2-Mouse’s scrollwheel to work. I’m almost going nuts, as it sucks to browse, paint, etc without that fucking wheel! I’ve read in a board that this seems to be a common problem with the Biostar iDEQ 200N barebone system I own. Well. Seems I have to get a USB driven mouse then. Or is there any chance anyone has the final solution for me?