The computer screen shows no signal, but the host is turned on.

The computer screen shows no signal but the host is turned on? Bian Xiao used the school computer when he was studying. Then, after a long time, sometimes there will be various situations, including the computer screen is not bright but the host is turned on, and there is no signal. What should I do at this time? Now Bian Xiao will share his experience with you, hoping to help you.

Tools Raw Materials Computer HP Light and Shadow Wizard 5 win 10 System

Method/Step 2 Step by Step Reading

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After talking about the possible causes and maintenance methods of the display screen, let's look at the problem of no signal on the display screen. First of all, let's conduct a comprehensive inspection of the connection between the computer monitor and the host computer, and plug all the connections to see if there are any connection problems. If the fault still exists, then we need to open the chassis to see if there are metals and other substances in the chassis, which will lead to a short circuit in the computer host circuit. Then we will smell the computer to see if it smells burnt, and if there are damaged components around the motherboard and CPU.

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After checking the whole chassis, there is nothing abnormal in the chassis, so we will deal with the dust in the chassis.

If you can't boot, then unplug the data cable 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, it means that 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.

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If the fault still exists, it is probably the fault of memory card, graphics card, CPU, motherboard, etc. At this time, we just need to plug and unplug these hardware or replace them again, and try to find the reasons one by one.

If the memory, graphics card, CPU and other devices are normal, then the BIOS is discharged, and the motherboard is placed outside the chassis in an isolated way, and connected with the memory, graphics card, CPU and so on for testing. If the computer can display, then put the motherboard in the chassis and test it until the cause of the failure is found. If the fault still exists, the motherboard needs to be returned to the manufacturer for repair.

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When the computer is turned on, there is no display, but there is an alarm. When the computer is turned on, the system BIOS starts POST (power-on self-test), and when a fatal error is detected in a device in the computer, the speaker is controlled to sound and 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.

abstract

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1. Check whether there is a problem with the display line or the interface of the video card or other connection errors.

2. Open the chassis to see if there is anything that causes short circuit or component damage.

3. Check whether the equipment is faulty.

4. Troubleshooting through alarm sound

Matters needing attention

Non-professionals should not open the chassis easily.

If necessary, find a manufacturer for after-sales service.

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