Reboot and Select Proper Boot Device Error

Hi, my computer was working fine yesterday but after cleaning some dust inside my pc today I had this error popping up on the screen when I started my computer. I was using a fabric cloth to clean the dust. Also when I press F12 to get into BIOS I couldn't locate the hard drive. Any help is appreciated!

Make sure your hard drive is connected properly, because it sounds like your hard drive isn't connected properly.

It turns out that one of the black connectors wasn't plugged into the hard drive. Thanks for the help!

You're welcome