Missing / Disappeared a CPU processor quad core AMD - Solved

[MY]

I red a lot of posts how to bring back 1 missing CPU core. I solved the issue in a very simple way and hope other users can benefit from it. In BIOS went to CPU and saw CPU recognition was set to Manual. I don't know why that has happened but I changed the BIOS setting to AUTO and all 4 cores appeared next time I booted.
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ASUS M4A785-M (AM2, AM2+, AM3)
QUAD CORE AMD 4950
2x2GB Kingston KHX 8500 Hyper 1066Mhz
GeForce 9500 GT