My PC doesn't start on the SSD HD as it should but in the BIOS

Hello and welcome capdec a most unusual problem and I am guessing that the motherboard may be going south - it is hard to tell because the files you sent are in French? and that makes it very hard to sort anything out.

Just so I have it right though you push the power on button and the machine goes straight to the BIOS? It does suggest to me that the BIOS button may be stuck down somehow (usually F2 on an Asus board) - try another keyboard and see what happens. Plus I suggest you only have the boot hard drive connected as it looks like you have two hard drives installed.

By the by can you boot into safe mode? If so then run these

https://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

https://www.sevenforums.com/tutorials/433-disk-check.html< if necessary include the /f and /r in the command line as per Option2

Yes, it`s very strange and actually almost impossible for the PC to go straight into the bios.

Is the ssd connected to the #1 sata port on the motherboard ?

Hum that is a thought and maybe the data drive is hooked up to somewhere where the boot drive is best. I still think the only drive should be the OS boot drive left in while the OP tries again and that BIOS button whichever one it is stuck on

Yes Gokhan I reckon it worth a try but I still think something is short cutting the power up process ie that BIOS button unless the board has been damaged by some other cause - so why not try a different keyboard perhaps??