Cpu fan full speed?

Nov 8, 2018
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First my specs:
Asus p5b plus
4gb ram 4*1GB 800mhz
E8400
280w psu
Nvs 290
250GB hdd

When i boot my pc, the cpu fan go full speed (or very fast). It also gets stuck on BIOS Flash screen. So I can’t get into windows. The only way I get into bios is by removing and replacing the cmos battery. In the bios i can see that the cpu fan is on 3500-3700 rpm. It is on the optimal setting. I changed it to performance mode and saved. The fan were much quiter! So i boot my pc again and boom, its stuck on bios Flash screen. I cant press anything. So i try to remove and replace the cmos battery again. It boots fine but now the cpu fan is on full speed again.

Anyone know how i get into Windows and my cpu fan will still be quiet?
 

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