Question BIOS suddenly refuses to boot into OS and force me to load default settings

May 18, 2019
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I have a PC working for 5 years. The motherboard is Gigabyte Z170 D3H. Today suddenly it refused to boot into OS, the screen saying "Failed to boot system, maybe due to incorrect configurations", it suggested I load the optimized default configurations. I did and it booted OK now.

But why? the system has been working fine. I didn't change any config recently. The only thing I changed from the default settings is the memory XMP profile 1 but that was 5 years ago.
Anw, after the BIOS boot fine with default settings, I changed the XMP to profile 1 again and it still work OK. No clue what happened to BIOS.
 

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