Msi K8n Neo2 Platinum whit FX53 Please Help

[CometMan]

Hi guys
First Of all i want to thanks anyone that could give me a hand on this issue, my problem is: I bought an Amd FX-53 a few days ago from a friend, my board is a msi k8n neo2 platinum 54g, i installed the cpu normaly,booted my system normaly, everything was normal and quite fast, once i had everything checked out, i went to the bios to modify the multiplier of the cpu, but only the default one works (12x), i tried 10x,11x,13x and nothing, the computer didn`t boot, tried the recent 1.6 bios and the problem remains the same, everything else is working fine, can anyone help me out im desperate
I have no idea what else to do

btw my system is:
Msi k8n neo2 platinum
amd Fx53
1gb ocz pc4000 vx whit ddr booster
x800xt pe
Ocz Modstream 520w

i had a 3500+ winchester installed last week and the multip. worked fine

Thanks to all in advance