New cpu not booting fans working

[psp3]

I recently replaced my athlon x2 240 with fx 4300. Now cpu is not booting. Fans are running but screen remains blank. Also had a weird issue of graphics card fans spins and stops and keeps doing this when I was using the athlon. Is this a psu problem? Doubt it since it was able to power athlon and hd7790 card. Motherboard is asus M5A78L MLX. Psu is 550w cooler master

 

[Themastererr]

More than likely need to reset CMOS as BIOS cannot accept faster clock rates on FX 4300 otherwise.

 

[alexoiu]

Try updating the board's BIOS. if you haven't so far (use the old CPU).

 

[psp3]

I updated bios using ez flash. How to do the cmos reset?

 

[psp3]

Also is the spinning and stopping of gpu fan somehow related to this. I notice this sometimes with the old athlon installed, but not during evry boot