Insert boot media?

i just reformat my hard disk today...and installed all its drivers...
...
...the thing is ... when i restarted it ... some error appeared saying...."insert proper boot media and press enter to continue",,, something like that...
..i already checked the hard disk connection, its power and is good...
...then i reboot it again then it well all fine just then...
.
..what could be the problem???? is their a damage or some kind or what???
... u really need info 'bout this...

You have likely made an error in the installation of your Windows or whatever software...
Or your hard drive has gone bad on the outer 8 sectors of the magnetic media and cannot be read.

Or maybe you forgot to change the order of your boot devices. Put the hard drive first and see if that solves it.