Installed New Power Supply, Missing OS?

My windows was working fine. I switched out my power supply, and now it keeps saying there's no OS. Is this a common problem?

I can't really access my specs because my comp is down, but I can get a link to basically what I have:
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More about installed power supply missing
  1. Something is not corrected properly. Possibly your boot drive.
  2. Is there anyway to check or know what should be booted from?
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Windows Power Supplies Windows 7