I need Help!

[woodsoul]

I just a bought a new power supply (http://www.amazon.com/Sentey-Bronze-Certified-Supply-MBP750-HM/dp/B00SN7CGAO/ref=sr_1_7?s=pc&srs=7725630011&ie=UTF8&qid=1460594454&sr=1-7&keywords=sentey) and after I installed it I keep getting a message saying Reboot and Select proper Boot device or Insert Media in selected Boot device and press a key. Did I do something wrong?

 

[Colif]

sometimes the answer to this is simply boot into bios and make sure your hdd is first boot device.

other times you need to do this: http://www.thewindowsclub.com/the-drive-where-windows-is-installed-is-locked

 

[woodsoul]

sometimes the answer to this is simply boot into bios and make sure your hdd is first boot device.

other times you need to do this: http://www.thewindowsclub.com/the-drive-where-windows-is-installed-is-locked

My hdd is fine and it is 1st priority but, when I switch back to my old power supply it works it is only with my new power supply that this happens.

 

[woodsoul]

FIXED!!!!!!!!!!!!!!!!!!
When I first installed the new power supply I kept the same power cable for my graphics card and hdd after I switched those with the cables that my power supply came with it worked perfectly.