Hello! The host starts, but cannot enter the system. What is the reason?

You can see which of the three methods: (1) the memory stick is loose, and then it is ok to plug it in; (2) Low throw and high suction _ 1976 [Purple Star] will discharge the BIOS battery (restore the BIOS factory default value). It is recommended to plug and unplug the graphics card and memory, clean up and polish the golden finger of the graphics card and memory. Troubleshooting is not displayed when the computer is turned on (check whether there is bulging capacitance). Step 1: First, check whether the external wiring of the computer is connected properly, then plug in all the wiring again to see if the fault is eliminated. Step 2: If the fault still exists, open the main chassis to see if there are any redundant metal objects in the chassis, or a short circuit caused by the deformation of the motherboard, smell whether there is a burning smell in the chassis, whether there are burnt chips on the motherboard, and whether there are damaged capacitors around the CPU. Step 3: If not, clean up the dust on the motherboard, and then check whether the computer is normal. Step 4: If the fault still exists, unplug the reset line and other switches and indicator lines on the motherboard, and then short-circuit the switch with a screwdriver to see if it can be turned on. Step 5: If you can't boot, unplug the data cables of hard disk, floppy disk drive and CD-ROM drive with the minimum system method, and then check whether the computer can boot. If the boot screen appears on the computer monitor, the problem is with these devices. Then connect the above devices to the computer one by one. When the equipment is connected, the fault reappears, indicating that the fault is caused by the equipment. Finally, focus on checking this equipment. Step 6: If the fault still exists, it may be caused by memory, graphics card, CPU, motherboard and other equipment. Then, check whether the memory, graphics card, CPU and other equipment are normal by plug-in method and exchange method, and replace them if they are damaged. Step 7: If the memory, graphics card, CPU and other devices are normal, then discharge the BIOS, put the motherboard outside the chassis in isolation mode, and connect the memory, graphics card, CPU and so on for testing. If the computer can display, then put the motherboard into the chassis for testing until the cause of the failure is found. If the fault still exists, the motherboard needs to be returned to the manufacturer for repair. Step 8: The computer is turned on, but there is an alarm. When the computer is turned on, the system BIOS will start POST. When the device in the computer detects a fatal error, it will control the speaker to make a sound to report the error. Therefore, there may be a failure without alarm sound when starting the machine. When there is no alarm sound when the computer is turned on, we can check the faulty equipment according to the meaning of BIOS alarm sound and troubleshoot it. (3) 1. The poor contact of the connecting cable is mainly caused by looseness, oxidation and dust. Clean the plug and socket, plug it in and out several times, or try to replace the data cable. 2. There is something wrong with the system program. Reinstall.