The main computer box can't be turned on, is the switching power supply broken?
①The most common troubleshooting method for computers that cannot be turned on
The most common reasons why the computer does not respond when it is turned on are: the main computer power cord is not connected properly, the display switch is not turned on, and the display power supply or display data cable is in poor contact.
When it is found that the computer does not respond when it is turned on, we need to first observe whether the power indicator of the computer is on after pressing the power button. If the power indicator is not on, there may be a problem with the power supply. You can check the power supply Whether the cable is connected to the external power supply well, whether there is a line fault, etc. When the computer power supply is poor, the computer will not respond when the computer is turned on. These need to do some simple troubleshooting to confirm. When the indicator light of the computer is on and the CPU fan inside the computer is running normally, then generally speaking, it can be preliminarily judged that there is no major problem with the power supply. Let’s check the monitor to see if the power indicator light of the monitor is on and whether the data cable of the monitor is connected well. At the same time, observe whether the indicator lights of the computer keyboard and mouse are on. Generally, if there is no problem with the host computer, the indicator lights of the computer keyboard and the mouse are normally on. In this case, the problem often occurs on the monitor, such as the switch of the monitor is not turned on. , the display data cable is not connected properly, or the display power supply is faulty, etc.
The above computer does not respond after booting. If we can’t find the problem through simple troubleshooting, it is recommended to use the replacement method. If you suspect that there is a problem with the monitor, you can try it with a good one. If the problem persists, try another data cable. If it still doesn’t work , then the problem is likely to appear on the host. In short, try to eliminate as much as possible, so that it becomes easier to find the problem. Generally, the troubleshooting method of the display is relatively simple, so I won’t introduce too much here. The following will focus on the introduction The computer does not respond when the computer is turned on due to a host failure.
②The computer does not respond when the computer is turned on due to a computer failure
Troubleshooting method for no display when the computer is turned on. (no alarm sound)
Step 1: First check whether the external wiring of the computer is connected properly, and re-insert each connection to see if the fault is eliminated.
Step 2: If the fault persists, then open the main case to check whether there is any excess metal in the case, or a short circuit caused by the deformation of the main board, smell whether there is a burnt smell in the case, whether there are burned chips on the main board, and whether there is any damage around the CPU. Whether the capacitor is damaged or not.
Step 3: If not, then clean the dust on the motherboard and check if the computer is normal.
Step 4: If the fault persists, then unplug the Reset cable on the main board and other switches and indicator lights, and then use a screwdriver to short-circuit the switch to see if it can be turned on.
Step 5: If it cannot be turned on, then use the minimum system method to unplug the data cables of the hard disk, floppy drive, and optical drive, and then check whether the computer can be turned on. If the computer display shows a boot screen, it means that the problem is in these devices. Then connect the above devices to the computer one by one. When connecting to a certain device, the fault reappears, indicating that the fault is caused by this device. Finally, focus on checking this device.
Step 6: If the fault persists, the fault may be caused by memory, graphics card, CPU, motherboard and other devices. Then use the plug-in method, exchange method and other methods to check whether the memory, graphics card, CPU and other devices are normal. If there is a damaged device, replace the damaged device.
Step 7: If the memory, graphics card, CPU and other equipment are normal, then discharge the BIOS, use the isolation method, place the motherboard outside the case, connect the memory, graphics card, CPU, etc. for testing, if the computer can display, then install the Install the motherboard into the case and test until the cause of the failure is found. If the fault persists, you need to return the motherboard to the factory for repair.
Step 8: There is no display but an alarm sound when the computer is turned on. When the computer is turned on, the system BIOS starts POST (power-on self-test). When a fatal error is detected in a certain device in the computer, it controls the speaker to issue a sound report. mistake. Therefore, there may be a failure that there is no display and an alarm sound when the machine is turned on. For the failure of the computer to turn on without displaying an alarm sound, you can check the faulty device according to the meaning of the BIOS alarm sound to eliminate the fault.
