Well it appears that the bios can't find the hard drive.
Restart the machine, watch for a message on the bottom of the screen saying press key to enter setup. Or you can try using the delete key just after the machine starts, start tapping the key.
Once in the bios look for a menu with the primary and slave ide configuration options on it. Should be two sets of two, primary master and slave, secondary master and slave. For the primary master set it to either auto or have it autodetect the hard drive. If it finds the drive you will need to save and exit
The other thing would be to remove the cover and check that the power and ide cable are connected firmly to the harddrive and the ide cable is firmly connected to the motherboard slot.