blinking HD LED codes, error?

[chipthamac]

My computer has been locking up for the past two weeks. I mean like instantly and totally freezing. No coming back without hard shutdown. Now, I have noticed that when it does this, the hard drive LED will blink once long and three times short. Anyone have a clue what is wrong? I have tried google but could only find cmos beep (sound) codes. Any help would be great. Thanks