hi there, i have an IBM 80gb hard drive and it is driving me crazy. im used to leave the pc on all the time, but ive went on vacations for 4 days and when i returned and turned on the pc, the hard drive just keeps on making a very strange, very sharp sound, i really dont know how to explain it. ive downloaded the drive fitness tool from ibm web site, and both queick and advanced tests returned with everything ok. anyone knows what might be wrong? ive checked all cables to see if there was anything wrong, but it is all ok. please help me. thanks in advance.