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Dosen't seem to be on the cpu support list? Seems to be an AM2+/AM3 cpu whereas your board seems to be only AM3+? I know little about AMD so sorry if i'm wrong.
Seems i was wrong about being AM3+ only, but the cpu seems not to be on the list. From what i remember, A64 and onwards cpus tended not to boot when not supported by BIOS in alot of cases (distinctly remember when i had 30 Winchester cpus and all the boards had an older Newcastle only BIOS, fun days flashing 30 boards with the one newcastle i had, soldered chip too so no hot flash!). Seems the Sempron 140 is the lowest it'll suppport.