The scene:
865PE motherboard, Seagate SATA 120G hard drive, 512M memory, hard disk "accidental" death, connected to the motherboard there is no response, although you can feel the drive motor rotating minor jitter noise. Life only lasted 3 months, is accidental death or a novelty factor?
Case analysis
The same shipment, only the hard drive stalled unexpectedly, according to host memory, hard drives have been using normal, no abnormal phenomenon, do not know how to go quiet. Speech in doubt with the quality. Case analysis, Seagate SATA 120G hard drive so far not reported significant quality defects, suspected death of the other hard drive killer, focusing on the motherboard and power supply, taking into account the motherboard is easy to over OZ and power prices are not high, test to practice deception detection means. Have two reconnaissance to the way forward, one to tell the boss unexpectedly turn off hard disk, for one, regardless of the other; second, to tell the boss drives stalled unexpectedly, while motherboard unstable to be replaced. The latter means that the new hard drive for still or turn off, if the murderer is the power of words. I chose the latter.
Breakthrough
If the hard drive case or motherboard cause a malfunction, then the anomaly will not recur, but anomalies still occur, and this anomaly led to a breakthrough progress in the case. For a week after the hard disk and motherboard, the owner called complaining: computer sound with noise, but only occur by chance. I immediately went to the scene detection, using headphones to listen, and sure enough the occasional noise and does not last long. Knew the most of, not motherboard to blame, suspect bad power performance is the biggest, long-term torture hard drive to death, sometimes the voice of noise is another evidence, exposed power supply filtering performance is poor, replace the power to say.
Closed 'dust' word
I am going to do this piece of board, the first tone to keep CMOS line to off-normal position, that is, clear position, some type of motherboard will not boot, and some can start, this mode is not insurance, and generally can be fool superior suppliers. To be safe, micro-transformers with the company labels the enameled wire, firing two short pieces of access reset. This trick really works, do not test card, can not tell. So I can smoothly change for the board.
Superior supplier confirmed that the expense of the hard disk does, but scrapped the hard drive power chip, which proved to be my guess.
Insufficient power supply voltage or current measurement is easy to do so, while the detection of fluctuations and filter performance is not easy, is hidden.