PC enters BIOS at startup time
PC enters BIOS at startup time
Hello,
System specifications
Mobo : ASUS Prime H610M-E D4
Pro : Intel 12400F
Memory : 24 GB (16+8)
GPU : RTX 3060 12 GB
Operating System : Windows 10 Pro
My PC will open the ASUS UFEI BIOS Utility during startup. It also takes a long time to produce the beep sound. In the BIOS it displays "no boot device found." When I switch the boot menu to "Launch CSM > Disable to Enable & after save & exit it starting my PC normally," the issue occurs repeatedly at startup. Both SSD and HDD have the same OS installed, with boot priority set for the SSD.
This problem appears suddenly. The SSD was installed about 1 year ago, but the issue started around 1 or 2 weeks ago. Please advise on a solution.
Under Launch CSM
Boot device control : UFEI and Legacy OPROM
Boot from network device : Legacy Only
Boot from storage device : Legacy Only
Boot from PCI-E/PCI Expansion Device : Legacy Only
Thank you in advance.
Verify the CMOS battery, it seems to be weak and isn't retaining settings.
If the BIOS battery replacement recommended by @CountMike resolves the issue, then consider these points:
Check your system configuration—have a 16GB DIMM plus an 8GB DIMM installed? Try removing the 8GB DIMM and observe if the boot time decreases. Running the system might become more stable when only two dissimilar DIMMs are active, especially if using Dual Channel mode.
It’s best to use matching pairs, such as 16GB with 16GB or 8GB with 8GB. You could also combine configurations, like 2x8GB plus 2x4GB for a total of 24GB, but remove the smaller groups. Have you performed MemTest86 on your RAM?
What operating system are you using? Windows 7, 8, 8.1, 10 or 11?
Did you create a clone of the hard disk and connect the original HDD when booting from the SSD for the first time? The boot partition might still be linked to the old HDD.
We should verify whether your SSD and/or HDD are configured for UEFI or CSM. UEFI is now common, while CSM is usually needed only for older systems. I sometimes enable CSM for legacy RAID cards.
On some older systems, the SSD appears as 'Basic' in Windows Disk Management, with BIOS set to boot CSM for MBR.
In newer setups, the SSD shows a GPT partition in Drive Management, and BIOS is typically UEFI (often with CSM disabled or prioritized lower).
If there’s a tiny 16MB GPT partition on the boot drive—rarely shown in management tools—it suggests a GPT disk and UEFI booting. This partition can be identified through utilities like Easus Partition Master.
In summary, some drives may be labeled 'Basic' and require CSM/Legacy settings, while others are GPT-based and need UEFI priority.
With two drives, you likely have BIOS settings for boot order and first boot device. The latter often takes precedence when switching between drives. It can become quite confusing in certain BIOS configurations.
It’s advisable to remove one drive to test the necessary BIOS settings for the remaining drive. Then attempt the other drive independently. If both boot successfully, the issue is probably with the SSD partition configuration on the HDD.
One drive might use MBR/CSM, while the other uses GPT/UEFI. How frequently do you change boot drives and start from the HDD?
I copied the hard disk to the SSD. What should I do next to fix the issue? The CMOS battery was replaced but the problem persists. I have a 16 GB and an 8 GB RAM, and it's working fine for a year so far. This issue has been occurring for a few weeks. Usually I boot from the SSD on first startup.