New System won't boot with 2nd hard drive and SSD Connected

Hello I just build a new system with 2 HDDs and a SSD. When I turn it on it tells me that "no OS was found, unplug other drives that don't have an OS on them." So I unplug the other drives and boots up. So I plugged the other 2 back in and it gives me the same error. Please help. Thanks.
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More about system boot 2nd hard drive ssd connected
  1. Best answer
    Go in to your BIOS and select which disk you want to be your default boot device.
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