Possible reasons why the host is turned on but the computer display does not light up:

1. Check whether the keyboard light is on. Press the numlock or caps switch key in the upper left corner of the keypad and see if the keyboard indicator light responds. If so, pay attention to the sound of the system starting up. If the keyboard light responds, it means that the system starts normally, but there is no display.

2. The display cable is not plugged in properly or is loose. Check whether the display cable behind the monitor and the back of the chassis is loose. If you have a discrete graphics card, check to see if it is plugged into the integrated graphics port. (The graphics card port is blue. You can tell by comparing the lines. The integrated graphics port is vertical | and the independent graphics port is horizontal -).

3. If the above two methods cannot solve the problem, it is not a cable problem. This kind of situation is usually caused by poor memory contact, which may be a problem with the graphics card or memory. Please ask professionals to repair after-sales service.

Extended information

No signal on the monitor

1. First, we conduct a comprehensive check on the connection between the computer monitor and the host, and re-plug each connection. Check again to see if there are any connection problems.

2. If the fault still exists, then we need to open the case to see if there are metal or other substances in the case that may cause a short circuit in the computer host circuit. Then we can smell the computer to see if there are any burnt components. Check the smell and look around the motherboard and around the CPU for damaged components.

3. After checking the entire chassis, if there is no abnormality in the chassis, then we will treat the dust on the chassis.

4. If the computer cannot be turned on, 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 a startup screen appears on the computer monitor, it means that the problem lies in these areas. devices. Then connect more than one device to the computer one by one. When a certain device is connected, the fault reappears, indicating that the fault is caused by this device. Finally, focus on checking this device.

5. If the fault still exists, it is likely to be a fault with the memory card, graphics card, CPU, motherboard, etc. At this time, we only need to plug and unplug the hardware, or replace it again, and try one by one. Find out the reason below.

6. If the memory, graphics card, CPU and other devices are normal, then discharge the BIOS, use the isolation method, place the motherboard outside the chassis, and connect the memory, graphics card, CPU, etc. for testing. If the computer can display , and then install the motherboard into the chassis and test until the cause of the fault is found. If the fault persists, the motherboard needs to be returned to the manufacturer for repair.

7. There is no display but an alarm sound when the computer is turned on. When the computer is turned on, the system BIOS starts to perform POST (power-on self-test). When a fatal error is detected in a device in the computer, it will control The speaker sounds to report an error. Therefore, there may be a problem that there is no display and alarm sound when the power is turned on. For problems with no display and alarm sound when the computer is turned on, you can check the faulty device according to the meaning of the BIOS alarm sound to eliminate the fault.

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