Alienware M14x Freezing on Startup

My laptop (running Windows 7) recently started freezing at startup, just before it reaches the login screen. The computer doesn't BSOD and I have to hold the power button to get out of it. I've run startup repair and system recovery without any success. When running diagnostics at startup all tests passed except the hard drive. The test produced the following event data: "Fail PSA V4206 Error 2000:01 42. Hard Drive 0 - S/N S2TBJB0C272456, self test unsuccessful. Status = 79" Not really sure where to go from here. Any help would be greatly appreciated. If you need additional info let me know.