after pressing the computer power key, the computer does not start, no post or enter the operating system phenomenon, often users can not process and affect normal use. Here we have a simple analysis of common fault phenomena, analysis and solutions, hoping to be helpful to users who have encountered such problems.
no reflection after pressing power key
malfunction Phenomenon: After boot screen does not have any display, did not hear the motherboard loudspeaker "drops" sound.
Failure Analysis: motherboard coms chip internal BIOS data was CIH virus or static problems such as corruption damage, unable to read, the system started unable to complete the self-test, so it cannot be started.
Known workaround: 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.
fault phenomenon: Press Power key, the CD-ROM light flashes, the motherboard power indicator light on, the power is normal, but the screen is not displayed, there is no "drip" sound.
Failure Analysis: cup corruption occurs after this behavior, the BIOS in the self-test process of the CPU first check, the CPU corruption can not be self-test, the computer can not start.
Known workaround: Check that the CPU is properly installed, check the CPU core for damage, use the replacement method to check if the CPU is damaged, and replace the CPU if the CPU is damaged.
Symptom : Boot without any display, also no hint, motherboard power is normal, cup is normal, fan is normal, but the screen is not displayed. There is no "drip" sound from the self-test.
Failure Analysis: After more than 3 years of use of the computer, the battery voltage for the BIOS setting is gradually reduced, unable to save the data, in some older chipset using the motherboard will be unable to complete the self-test phenomenon, the motherboard itself hardware is not a problem.
known workaround: Purchase CR2032 lithium battery, replace the existing battery on the motherboard to complete the self-test, and then reset the BIOS parameters.
Symptom : When the Power key is pressed, the computer shuts down automatically or does not respond immediately.
Failure Analysis: Some motherboard manufacturers in order to protect the CPU is not in the case of the cooling device, causing the CPU burn occurs, when the CPU fan is not installed or the motherboard Cfan interface to connect the CPU fan power cord, or the CPU fan is connected to the Sfan (System fan interface), will not boot.
Known workaround: Properly connect the CPU fan to the motherboard's power connector and confirm that it is connected to the Cfan's three-core dedicated CPU fan interface next to the CPU.
Symptom : When the Power key is pressed, the self-test fails, the monitor is not displayed, the monitor LED is orange or blinking.
Failure Analysis: During the self-test, the video card does not pass the self-test, unable to complete the basic hardware detection, unable to start.
Known workaround: Check if the are finger is oxidized or the AGP interface has a large amount of dust causing a short circuit, rub the gold finger with the eraser, and clean the dirt in the AGP interface with the fur tiger. Also use the replacement method to eliminate the problem of video card corruption, if the video card is damaged, replace the video card.
failure phenomenon: After the boot did not complete self-test, did not hear a "drip" sound, at the same time issued a continuous "drip-drip-drip ..." sound.
Failure Analysis: According to BIOS manufacturer provided by the BIOS alarm beep Note, the problem is generally out of memory, memory corruption is relatively small, most of the problems are due to memory oxidation or poor socket contact.
Known workaround: First check the gold finger, memory slots, chips and PCB if there are traces of burning, if there is a suggestion to replace the memory. If not, use the eraser to lightly rub the gold finger and reinsert the memory slot.
Symptom : Power is OK after powering on, but Num and other LEDs on the keyboard are not flashing. The self test cannot be completed.
Failure Analysis: The motherboard's keyboard controller or I/O chip is damaged and cannot complete the self-test.
Known workaround: Replace the I/O chip with the manufacturer and check the keyboard interface circuit.
Symptom : Press Power key is not responding, power and hard drive LED is not lit.
Fault Analysis: Through the use of multimeter on the power supply each output voltage check, found that 12V 5V 3.3V are abnormal, and the standard voltage gap is very large, power supply internal circuit problems.
known workaround: Solve the problem after replacing the high-quality 300W power supply.
fault phenomenon: the parts of the chassis are removed, do the test is normal, when installed into the chassis can not boot, and sometimes the chassis up to normal boot, flat after the boot cannot be turned on.
Failure Analysis: Some chassis production is not standard, resulting in some motherboard after the deformation or caused some board deformation, the bottom of the motherboard and chassis contact, resulting in a short circuit, resulting in the inability to boot.
Known workaround: Replace the high quality chassis and install the parts using standard accessories.
Symptom : The power light flashes quickly after powering on or pressing the power key. The screen is not displayed.
Failure Analysis: sometimes some poor quality chassis power and reset easily stuck inside or internal short-circuit, causing the button is always connected, repeated power-on or restart status, resulting in the illusion of no boot.
Known workaround: Replace the damaged key or use some lubricant to lubricate the button to reduce friction.
