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Windows 7: Bios resets SATA configuration on shutdown and restart

08 Dec 2014   #1

Windows 7 Ultimate 64-Bit
Bios resets SATA configuration on shutdown and restart

Hey guys, first time posting here. Got a strange problem with my custom built system that's been going on for a couple weeks now.

Every time i shut down or restart my computer it gives me the error message "Missing Operating System". I fix this by restarting, going into the BIOS, and changing the SATA configuration to RAID. It seems like something is causing the SATA configuration to reset to defaults every time i shutdown or restart. I also have to manually reset the date/time every time i restart or shutdown.

This isn't a huge problem, just an inconvenience as I have to do this every time it shuts off so I've been leaving it in standby for the past couple days. I have Avira Antivirus and Malwarebytes installed with a generally clean system. Any help would be appreciated as I have only a basic understanding of BIOS and I can't think of anything that would cause this to happen. Also, I can provide any specs of my computer if requested.

Thanks for your help!

My System SpecsSystem Spec
08 Dec 2014   #2

Windows 7 ultimate 64-bit

This is most likely a cause of a weak or dead cmos battery which sits in/on the motherboard. That battery is what maintains the date/time and also mantains the bios settings. Therefore; if it is weak or even dead; then your bios settings will most likely reset to defaults every time you shut your system off and will also reset the date/time making you reset it to the correct date/time. So try replcing the battery and see what happens. Post back if there is still a issue.
My System SpecsSystem Spec

 Bios resets SATA configuration on shutdown and restart

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