The link that saint gave you shows you which cpu's will work with the board you have, and the sempron 140 is not on that list so your motherboard will not be able to use it, if you select one of the cpu's from that list it will support it.
Click Saints link, and when the page loads, look just underneath the picture of the Motherboard, there are five tabs, select the one on the far right to see a list of which chips you can use.
Hope this helps and sorry if I wrongly assume your english is not perfect, no offence intended
Moto