Win7 system boot prompts can not find the hard disk how to do

            
1. Hard disk data cable and power cable are loose, oxidized or broken. Solution: Try changing the power connector, data cable or ide/sata interface.
2, may be some motherboards off the sata interface, can not find sata hard disk
Solution: to open the sata interface in bios.
3, overclocking the system, the hard disk can not work properly
Solution: Restore to the default settings or reduce overclocking.
4, when the hard disk is used for a long time, the gold finger oxidation on the back circuit board causes poor contact
Solution: Remove the circuit board and clean the oxide on the gold finger.
5, may be too many ide devices on the computer, resulting in increased initialization time, and the corresponding self-test time did not increase, causing the system can not detect the hard disk or detect timeout
Solution: extend the time setting, in In the bios, find the "boot delay time" option or "ld dedeay time", the motherboard bios without this option can also set the number of memory self-tests to 3 times to extend the self-test time.
6, when the computer is useless for a long time, and in a humid environment, the components on the hard disk are damp, there will be problems that the hard disk can not be detected
Solution: first disconnect the power supply, then use the hair dryer evenly Heat and dehumidify the hard drive.
7, may be the power quality problem or load too much equipment, resulting in low voltage output of +12v caused by the hard disk can not work properly
Solution: replace the power supply with good quality or power.
8, in the bios "standard cmos feaures", the hard disk is set to no
Solution: set to auto.
9, ide jumper settings are wrong, the hard disk and other shared data line ide devices have set the jumper to "master" or "slave";
Solution: change one of the ide jumpers You can;
10, the reason for the physical bad sectors of the hard disk
Solution: It is recommended to take a professional computer repair point for maintenance.