After the computer POWER button is pressed, the computer cannot be turned on. There is no power-on self-test or enter the operating system, which often prevents the user from handling and affecting normal use. So what if the computer can't boot ? The following decoration home decoration network Xiaobian will bring you the reason analysis and solution for the computer can not boot, I hope to help users who encounter such problems. What if the computer won't boot? The computer can't be turned on. Symptom 1. After the boot, there is no display on the screen. I don't hear the "drop" sound of the motherboard speaker. Analysis of the cause: The internal BIOS data of the motherboard COMS chip is damaged by CIH virus or static electricity, and cannot be read. The system startup cannot complete the self-test, so it cannot be started. Solution: Contact the motherboard manufacturer to replace the new COMS chip or find the BIOS file provided by the motherboard manufacturer to write using the burner. The computer can not be turned on. 2. After the POWER button is pressed, the CD-ROM drive flashes, the power-on indicator of the motherboard is on, the power is normal, but the screen is not displayed, there is no “drop†sound. Analysis of the cause: This phenomenon occurs after the CPU is damaged. The BIOS first checks the CPU during the self-test. The CPU fails to pass the self-test and the computer cannot be started. Solution: Check if the CPU is installed correctly, check if the CPU core is damaged, use the replacement method to check if the CPU is damaged, and if the CPU is damaged, replace the CPU. The computer can not boot fault phenomenon 3, no display, no prompt, the motherboard power is normal, the CPU is normal, the fan is normal, but the screen is not displayed. There is also no "drop" sound passed by self-test. Analysis of the cause: After the computer is used for more than 3 years, the battery voltage for the BIOS setting is gradually reduced, and the data cannot be saved. In some motherboards that use the early chipset, the self-test cannot be completed, and the hardware of the motherboard itself is not problematic. Solution: Purchase the CR2032 lithium battery, replace the existing battery on the motherboard to complete the self-test, and then reset the BIOS parameters. The computer can't be turned on. Symptom 4. After pressing the POWER button, the computer will automatically shut down or nothing happens. Analysis of the cause: Some motherboard manufacturers have caused the CPU to burn out in order to protect the CPU from the heat sink. If the CPU fan is not installed or the CPU fan power cable is not connected to the motherboard CFAN interface, or the CPU fan is connected to the SFAN (system) When the fan's interface is on, it will not turn on. Solution: Connect the CPU fan to the motherboard's power connector correctly and confirm that it is connected to the CFAN's three-core dedicated CPU fan connector next to the CPU. The computer can't be turned on. Symptom 5. After pressing the POWER button, the self-test cannot pass, the display is not displayed, and the indicator light is orange or blinking. Analysis of the cause: During the self-test, the graphics card did not pass the self-test and could not complete the detection of the basic hardware and could not be started. Solution: Check if the gold finger of the graphics card is oxidized or there is a lot of dust in the AGP interface, causing a short circuit, rub the gold finger with the rubber, and use the leather tiger to clean the dust in the AGP interface. At the same time, use the replacement method to eliminate the problem of graphics card damage. If the graphics card is damaged, replace the graphics card. The computer can't be turned on. Symptom 6. After the boot, the self-test is not completed. There is no “drop†sound, and a continuous “drop-drop-drop...†sound is emitted. Analysis of the cause: According to the description of the BIOS alarm tone provided by the BIOS manufacturer, the problem is generally in the memory, the probability of memory corruption is relatively small, most of the problems are caused by memory oxidation or poor slot contact. Solution: First check the gold finger, memory slot, chip and PCB for signs of burnout, if there is a suggestion to replace the memory. If not, use the eraser to gently rub the gold finger and reinsert it into the memory slot. The computer can't be turned on. Symptom 7. After the power is turned on, the power is normal, but the NUM and other indicators on the keyboard are not flashing. Unable to complete self-test. Analysis of the cause: The keyboard controller or I/O chip of the motherboard is damaged, and the self-test cannot be completed. Solution: Replace the I/O chip with the manufacturer and check the keyboard interface circuit. The computer cannot be turned on. Symptom 8. Pressing the POWER button does not respond, and the power and hard disk indicators are not lit. Analysis of the cause: By using a multimeter to check the output voltage of the power supply, it is found that 12V 5V 3.3V is abnormal, and the standard voltage is very different, and there is a problem in the internal circuit of the power supply. Solution: After replacing the high quality 300W power supply, the problem is solved. The computer can not be turned on. Symptom 9. Disassemble the components in the chassis and test it normally. When it is installed in the chassis, it cannot be turned on. Sometimes the chassis can be turned on normally and can not be turned on after being placed flat. Analysis of the cause: Some chassis are not made in standard, which causes some motherboards to deform after installation or cause some boards to be deformed. The bottom of the motherboard is in contact with the chassis, causing a short circuit and causing failure to boot. Solution: Replace the high quality chassis and install the components using standard accessories. The computer cannot be turned on. Symptom 10. When the power is turned on or the POWER button is pressed, the power light flashes rapidly. The screen is not displayed. Analysis of the cause: Sometimes the POWER and RESET of some poor quality chassis are easy to be stuck inside or short-circuited internally, causing the button to be always connected, repeatedly turning on or restarting, causing the illusion that the power cannot be turned on. Solution: Replace the damaged button or lubricate the button with some lubricant to reduce friction. The above is what the small series brought to you can not boot the computer? The whole content of the cause analysis and solution, I believe that after reading this article, you have a basic understanding of the computer can not boot, if you want to know more about the decoration consultation, please click to enter the decoration knowledge channel. More related wonderful reading: What should I do with a black screen on my computer? What are the reasons for the black screen of the computer? Why can't the computer turn off the machine? What if the computer can't shut down the machine? What is the reason for the slow response of the computer? How to deal with slow computer response? What is the reason for the laptop keyboard failure? How to deal with it? How does the computer reinstall the system? Computer reinstallation system steps hot air brush was created to replace both blow dryers and wooden hair brushes. Now, instead of holding the devices in both hands, a woman can use a lightweight device that dries and curls (or straightens) hair simultaneously. 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