BIOS / CSM problem?

I have been having a problem with my Asus desktop for about the last 2 months. I mostly leave it on all of the time. Almost every morning now, I check it when I get up in the morning. I have been getting the following message:

The current BIOS setting do not fully support the boot device.

Click OK to enter the BIOS setup.

Go to Advanced - Boot - CSM Parameters, and adjust the CSM (Compatibility Support Module) settings to enable the boot device.

I do this and then enable or disable the CSM, hit F10 to save, and then restart the computer. I then, most of the time, have to go back in and reset to Automatic or just hit F5 to load optimized defaults. I restart and it will load Windows normally. I am good for a day or two before I get the BIOS / CSM message.again. I the go through the procedure again and it will load as it should.

What do I need to do in order to fix this problem?

Any help would be greatly appreciated.

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The end is nigh.

Sorry, I can't resist writing that.

This is one of the symptoms of a HDD heading south. The next move is not testing but a full clone of the drive before we begin any HDD tests. If this drive is a Seagate I no longer test but replace it.

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Cheap test

Replace the bios battery.

Do have a full backup of that hdd and a way to restore it if it needs to be replaced.

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