Hard drive failure - Compaq N400. have compaq evo N400c, crashed over the weekend and now

Question

have compaq evo N400c, crashed over the weekend and now alternates between fixed disc parameter or BIOS error system halted (on black screen) or more commonly i get repeated non system disk or disk error replace and strike any key when ready - when I CTRL ALT Delete, i can get prompt back to compaq screen but immediately followed by non system disc error when i strike any key, or if i depress a key for 3+ seconds get loud bleeps Is this terminal problem with the hard-drive?