AMD Mobile Athlon 64 4000+ and ASUS K8N-E

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Ok i put 4000+ Newark CPU in my ASUS K8N-E mb because i have an old sempron 2600 and i thought it would work cause i found on the internet it works with K8N and K8N-E DELUXE, but when I start the PC it dosent post or just shuts down by itself and i flashed bios to latest. Please can someone help and also tell me is this Mobile Athlon 64 4000+ faster and better in games than AMD Athlon 64 3700+ for socket 754? And did anybody tried this or any mobile cpu on ASUS K8N-E motherboard?