I want to change my 15 pin vga cable to my monitor

Hi,
There are two types of cable set up with VGA monitors. The newer ones have a cable that is detachable at both ends. In other words the cable can be unplugged from the monitor and the computer. These, of course are easily changed. They can be purchased at places like Best Buys,
CompUSA, TigerDirect.com. Below is a listing on Ebay for a replacement for about 8 dollars including shipping.
SVGA-VGA-HD15-/280624443642?pt=LH_DefaultDomain_0&hash=item41568530fa">
http://cgi.ebay.com/Male-to-Male-15ft-PC-Monitor-Cable-Cord-SVGA-VGA-HD15-/280624443642?pt=LH_DefaultDomain_0&hash=item41568530fa

If you have the type of cable that is permanantly mounted to the back of the monitor, then you would have an extensive operation to replace the cable and it would likely be more expensive than the monitor was in the first place to replace it.
Hope this helps,
Best Regards,
Mark