Bios Mods -The Best BIOS Update and Modification Source

Hi

I have a little problem with my BIOS.
First, here is my configuration :
• Gigabyte GA-MA790X-DS4 (Main BIOS: F7 - Backup BIOS: F7)
• AMD Phenom X4 9600
• 4 gigabytes of Kingston HyperX RAM in DDR2
• AMD Radeon HD 5450 (more poor you die)

My PC can boot using F7 BIOS. If I install F9 or F10d version : no POST, CPU fan runs at a slow speed.
I must change my AM2+ CPU to an AM2 CPU in order to get POST and flash older BIOS.
I really don't understand why it does that!

I'm sharing the link of the 3 BIOSes (Working F7, non-working F9 and F10d). Thanks a lot for your help and this amazing forum!
Working F7: http://download.gigabyte.eu/FileList/BIO...ds4_f7.exe
Non working F9: http://download.gigabyte.eu/FileList/BIO...ds4_f9.exe
Non working F10d: http://download.gigabyte.eu/FileList/BIO...4_f10d.exe

You don't need F9 & F10D BIOS cause they add support for AM3 CPU only.