Question PC goes to BIOS during startup

[Nayanmanna]

Hello,
System spec
Mobo : ASUS Prime H610M-E D4
Pro : Intel 12400F
Ram : 24 GB (16+8)
GPU : RTX 3060 12 GB
OS : Windows 10 Pro
My PC is going to ASUS UFEI BIOS Utility menu during start-up. It also takes long time to come the beep sound. On BIOS its showing no boot device found, but when I change the boot menu "Launch CSM > Disable to Enable & after save & exit it starting my PC normally. This issue is happening near to every time during start-up. I have one SSD & one HDD both have same OS installed. Boot priority done to SSD.
This problem happening suddenly. I have installed the SSD around 1 yr ago but this issue is happening from around 1 or 2 wks. Please suggest the 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

Thanks in advance.

 

[CountMike]

Hello,
System spec
Mobo : ASUS Prime H610M-E D4
Pro : Intel 12400F
Ram : 24 GB (16+8)
GPU : RTX 3060 12 GB
OS : Windows 10 Pro
My PC is going to ASUS UFEI BIOS Utility menu during start-up. It also takes long time to come the beep sound. On BIOS its showing no boot device found, but when I change the boot menu "Launch CSM > Disable to Enable & after save & exit it starting my PC normally. This issue is happening near to every time during start-up. I have one SSD & one HDD both have same OS installed. Boot priority done to SSD.
This problem happening suddenly. I have installed the SSD around 1 yr ago but this issue is happening from around 1 or 2 wks. Please suggest the 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

Thanks in advance.

Start by checking and replacing CMOS battery, it's probably weak and doesn't retain settings.

 

[Misgar]

Ram : 24 GB (16+8)

If the BIOS battery replacement suggested by @CountMike does fix the problem consider this:-

If you have a 16GB DIMM plus an 8GB DIMM, try removing the 8GB DIMM and see if it takes less time before the beep sound is heard. The system might be getting confused with two dissimilar DIMMs if you're running them in Dual Channel mode.

Ideally you should use matched pairs, e.g. 16GB + 16GB or 8GB + 8GB. Of course you might be running 2 x 8GB plus 2 x 4GB to make 24GB, in which case, remove the 2 x 4GB. Have you run MemTest86 on your RAM?

one SSD & one HDD both have same OS installed.

What OS? Windows? 7, 8, 8.1, 10 or 11?

This problem happening suddenly. I have installed the SSD around 1 yr ago

Did you clone the hard disk to the SSD and leave the hard disk connected when you booted from the SSD for the first time. The boot partition for the SSD might still be on the HDD.

On BIOS its showing no boot device found, but when I change the boot menu "Launch CSM > Disable to Enable & after save & exit it starting my PC normally.

We need to check if your SSD and/or HDD are set up to boot UEFI or CSM. UEFI tends to be the norm now, with CSM only required for legacy support. I sometimes enable CSM for old LSI RAID cards.

I have some really old systems where the boot SSD is shown as 'Basic' (left hand pane)) in Windows Disk Management and the BIOS is set to boot CSM for MBR.

In modern systems, the boot SSD is shown as GPT (left hand pane) in Drive Management and the BIOS is normally set to UEFI (quite often with CSM disabled, or with CSM set to a lower priority than UEFI).

If there's a hidden (very small) 16MB GPT partition on the boot drive (not usually displayed in Drive Management) this implies a GPT disk and UEFI booting. This 16MB partition is revealed in utilities such as Easus Partition Master.

To recap, some boot drives might be 'Basic' and need the BIOS set to CSM/Legacy. Other boot drives might be GPT and require UEFI to take priority.

Since you have two drives, you'll probably have one section in the BIOS where you set the boot order of drives, plus another section where you select the first boot drive. I find the latter often takes priority when booting from multiple drives. It can all get a bit confusing in some BIOS.

I suggest removing one drive and see what settings are required to boot the remaining drive. Then try the other drive on its own. If they both boot on their own, you don't have a problem with the boot partition for the SSD residing on the HDD.

One drive might boot MBR/CSM. The other drive might boot GPT/UEFI. How often do you switch boot drives and start from HDD?

 

[Nayanmanna]

Start by checking and replacing CMOS battery, it's probably weak and doesn't retain sett

If the BIOS battery replacement suggested by @CountMike does fix the problem consider this:-

If you have a 16GB DIMM plus an 8GB DIMM, try removing the 8GB DIMM and see if it takes less time before the beep sound is heard. The system might be getting confused with two dissimilar DIMMs if you're running them in Dual Channel mode.

Ideally you should use matched pairs, e.g. 16GB + 16GB or 8GB + 8GB. Of course you might be running 2 x 8GB plus 2 x 4GB to make 24GB, in which case, remove the 2 x 4GB. Have you run MemTest86 on your RAM?


What OS? Windows? 7, 8, 8.1, 10 or 11?


Did you clone the hard disk to the SSD and leave the hard disk connected when you booted from the SSD for the first time. The boot partition for the SSD might still be on the HDD.


We need to check if your SSD and/or HDD are set up to boot UEFI or CSM. UEFI tends to be the norm now, with CSM only required for legacy support. I sometimes enable CSM for old LSI RAID cards.

I have some really old systems where the boot SSD is shown as 'Basic' (left hand pane)) in Windows Disk Management and the BIOS is set to boot CSM for MBR.

In modern systems, the boot SSD is shown as GPT (left hand pane) in Drive Management and the BIOS is normally set to UEFI (quite often with CSM disabled, or with CSM set to a lower priority than UEFI).

If there's a hidden (very small) 16MB GPT partition on the boot drive (not usually displayed in Drive Management) this implies a GPT disk and UEFI booting. This 16MB partition is revealed in utilities such as Easus Partition Master.

To recap, some boot drives might be 'Basic' and need the BIOS set to CSM/Legacy. Other boot drives might be GPT and require UEFI to take priority.

Since you have two drives, you'll probably have one section in the BIOS where you set the boot order of drives, plus another section where you select the first boot drive. I find the latter often takes priority when booting from multiple drives. It can all get a bit confusing in some BIOS.

I suggest removing one drive and see what settings are required to boot the remaining drive. Then try the other drive on its own. If they both boot on their own, you don't have a problem with the boot partition for the SSD residing on the HDD.

One drive might boot MBR/CSM. The other drive might boot GPT/UEFI. How often do you switch boot drives and start from HDD?

I have clone the hard disk to the SSD. What to do now to solve the issue. I have replaced the cmos battery but the issue still happening. And I have one 16 gb and one 8 gb ram. But for 1yr it's working fine. This problem is happening for few weeks. I generally boot for SSD for first startup.