Fault Phenomenon: This summer, the author upgraded the original machine and purchased the I845GL motherboard and P4 Celeron 1.8GHz CPU. For the savings, the original display and Mai Tuo 20GB 5400RPM hard disk are retained, and the chassis and power supply are configured with more than 100 yuan. The machine started to run longer, one month later, I found that the hard disk sometimes squeaks when reading and writing data, but I didn't care at the time. After a while, the hard disk issued a "crumber" sound when booting the BIOS self-test, and the screen prompt can't find the hard drive. After some test, it turned out that the hard disk is broken! Perhaps the old hard drive has arrived, so I changed a Seagate 40GB 7200RPM hard drive. But less than a month, the hard drive is broken.
Analysis resolution: What is the cause of the hard disk frequently damaged? I check all accessories to check, except for the motherboard, CPU, chassis and power supply before upgrading, and there should be no problem, so check the focus on replacement accessories. After the replacement test, the motherboard and the CPU have no problem, and the chassis seems to have no problem, it seems that the biggest "suspect" should be the cheap hit power supply. I replace a good quality brand power supply, and I have purchased a new hard drive and didn't have problems in use.
Summary: Since the inferior power supply is insufficient and the output voltage ripple is large, the hard disk is not normal, and there is a fault.
The power supply is the power source of the computer components, and many assembly machines are related to the quality of the power supply. The harm of inferior power supplies is mainly in the following aspects: 1. Work hard; 2. The province of EMI filter (inductance, capacitance, etc.), poor anti-interference ability, any interference from the grid will affect the normal operation of the machine There is a crash, the program is wrong, and there is noise in the speaker. 3. Output voltage is unstable and no protection circuit, which is easy to damage other devices; 4. The output power is insufficient, resulting in poor optical drive reading. It is recommended that the user chooses the quality of the quality, the output power is large, and the power is output. Don't save money on the power supply!
