No display at all

[superfly_guy81]

I wanted to upgrade my athlon 64 to a AthlonII x2 6400+, but in order to do that I needed to update my bios. I run the update a as it's rebooting I get no display on my monitor at all. Can someone please help

Mobo: A8M2N-LA
CPU: Athlon II X2 6400+
Gpu: GTX 750ti Sc( not installed yet)


I just wanted to update my old computer so I can run some low end games on it but now it's completely jnuasable please help

 

[Calvin7]

Motherboard supports the following processor upgrades

•AMD Athlon 64
• Athlon 64 X2 up to 5000+
•AMD Sempron

Only Athlon 64 X2 up to 5000+ supported.

 

[superfly_guy81]

Motherboard supports the following processor upgrades

•AMD Athlon 64
• Athlon 64 X2 up to 5000+
•AMD Sempron

Only Athlon 64 X2 up to 5000+ supported.

I've read on multiple times that the 6400+ works but is just identified as "unknown CPU" , and I have installed the athlon II X2 6400+, my apologies I still have the Athlon 64 250 installed and I am still getting no display