Can not enter the system when booting

" Cannot enter the system after booting: Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and prell a key"

Your computer may not detect the hard disk (cannot detect the hard disk Symptom: The hard disk information is not displayed in the IDE detection when booting.) This will display ""“reboot and select proper boot device or insert boot media in selected boot device and press a key" before entering the system. . Reasons for failure of hard disk detection: 1) The BIOS of the motherboard is out of power, and the hard disk information is not recorded. If your system date is incorrect, it is probably the reason. Solution: Replace the BIOS battery and re-enter the BIOS to detect the hard disk. 2) The IDE line is not of good quality or is not plugged in well. Solution: Change one IDE cable or plug the IDE cable into another IDE slot of the motherboard. Do not connect the hard drive cable to other IDE devices. For example, the CD-ROM drive, separate the two IDE cables, and correctly set the master/slave disk. 3) The hard disk is faulty and may need to be replaced. 4) If your computer can detect the hard disk every time and can't enter the system, re-format the hard disk and reinstall the system.