Finally I solved the problem, Opti had old A08 BIOS and in unexpected circumstances it can automatically set "NIC boot image" by Intel Boot Agent in first boot option and also crash F2 and F12 when loading boot BIOS. I updated BIOS to version A10 and finally you can enter BIOS to disable IBA.  
I have an Opti 790 SFF that after changing the disk for an SSD started to boot with the Intel Boot Agent and then windows 7 of the SSD starts. The issue is that it doesn't allow to enter the BIOS with F2, nor does it recognize F12, I was remove the battery from motherboard and wait 10 minutes trying to reset the bios and nothing.I was try to boot without perimetrals but nothing changed ... always the same sequence ----- DELL logo -> IBA -> SSD How can I enter the bios again to deactivate the Intel Boot Agent ??? please Help
Intel Boot Agent doesn't allow to enter the BIOS