PC boots to BIOS screen instead of windows

My system works very well for a few years but suddenly it cannot boot directly to windows. Here are a few points I've observed that are different then when it works normally:1. Pressing power button takes longer (around 10 seconds longer) for the power LED to light up. It also takes longer for the beep to sound.2. At the display card screen, press DEL or F2 did not bring me to the UEFI, it just didn't have any response.3. Then, even if I didn't press anything, it display the AMIBIOS screen (attached) but there is no error mentioned, only showing the h/w config (USB keyboard is 0 because I am using a PS2 KB).4. Follows it to press F1 then it bring me to the UEFI where I found nothing unusual, all h/w are detected.5. In UEFI select the boot disk to boot and it boot to windows as it normally did.
After using the PC for a while, if I reboot or shutdown and restart, it does not have this problem and go directly to windows. But if I shut it down and start it after the night, the problem appears every time. I would appreciate any help to resolve this problem or point me the direction where I can understand more. Thank you in advance.

I would first replace the CMOS battery (CR2032) and load the BIOS defaults.

Steve C said:

I would first replace the CMOS battery (CR2032) and load the BIOS defaults.

If the CMos battery isn't holding the BIOS settings you'll also see that the clock (date and time) is wrong.

Put in a new BIOS/UEFI settings battery, usually a 3v Lithium CR2032.
In my experience they last about 5-8 years. These days the clock being wrong does not usually happen. I use a voltmeter, less than 3v and it needs replacing.

Helmut said:

Put in a new BIOS/UEFI settings battery, usually a 3v Lithium CR2032.
In my experience they last about 5-8 years. These days the clock being wrong does not usually happen. I use a voltmeter, less than 3v and it needs replacing.

I use my PC about 2 hours per day and turn it off at the mains when not in use. I find the CMOS battery only lasts about 2 years since there is no power to the PC most of the time. CMOS batteries are c. 3.2V when new then discharge and plateau at c. 2.8V for a long time before the voltage quickly declines when the battery expires. My Gigabyte motherboard can fail to boot if the battery voltage is under 2.9V.

Thank you for all the replies. Replacing the battery solved the problem.

Good you fix it.

Please mark this thread as solved.

Hi,
Usual cause for going straight to bios is no sata/ hdd/ ssd detected.