A hard disk could not be found. I don't know what to do from here.

So, my computer (alienware Aurora r4) was completely frozen, no response from mouse, keyboard, nothing. I reset by holding down the power button. When I turned it back on, it beeped once, then recommended that I run startup repair. I tried to restore from a system image, and got error message "the system cannot find the file specified 0X80070002". It took me to system recovery options and I tried startup repair. It said "windows cannot repair this computer automatically." I clicked on "view diagnostic and repair details" and at the bottom it said "root cause found: a hard disk could not be found. If a hard disk is installed, it is not responding." When restarting, it will not allow me to select "start windows normally." I suspect the keyboard is not responding because it won't even let me select startup repair, it just automatically selects it when the time runs out. I also suspect that selecting "start windows normally" won't help me anyway since the computer can't find the hard drive.
I have no idea how to proceed from here. I know exactly Jack squat about hardware so I wouldn't know how to check if the hard drive is connected even if I did open it up. Please help.

I can't go into the BIOS because the computer is not accepting keyboard input during startup.

Can you borrow another keyboard from your friend and check?