Desktop Windows does not boot successfully and also shows no signal

The reasons and solutions for the display of no signal after the desktop is turned on are as follows:

1) The first reason: it is possible that the connection between the desktop host and the monitor is not in good contact (especially the interface is not plugged in or loose), and there may be a problem with the data cable of this connection, so there will be no signal input to the screen, no display, black screen, solution: just re-plug the connected data cable, or replace the data cable.

2) The second reason: due to the formation of an oxide layer on the surface of the gold finger of the memory or independent graphics card, resulting in poor contact between the memory and the memory slot, the poor contact between the graphics card and the graphics card slot, resulting in a black screen and no signal output

Solution: You can turn off the power first, open the compartment, dial out the memory, use the eraser against the part of the gold finger (that is, where there is a copper sheet,) wipe it back and forth a few times, and then insert it back into the memory slot (or insert it back into the memory slot), it's OK, if there is an independent graphics card, you can also use the same method to deal with the graphics card, and then insert it back into the graphics card slot, and finally install the machine, restart the computer and it's OK, (take the memory ** as follows:)

<>3) The third reason: that is, the graphics card's video memory is soldered, the performance of the main chip is reduced, the graphics card BIOS is disordered, and the control power supply IC is problematic, which will cause the graphics card to fail to work normally, that is, the graphics card is broken, and naturally the computer will have no signal output, and it will not be able to display, and the screen will be black when it is turned on.

Your question is relatively troublesome, and I don't make it clear what the situation is. I can only give you some advice: Is there a boot prompt when the boot is on?

If there is no reason, it could be that the power supply is broken, or something is wrong with the motherboard itself. If there is a tone, you can search the web for the meaning of the tone. If there is a problem with the power supply or motherboard, the computer is not working, where do you get the display output?

If you boot up and there is no signal, it is estimated that the graphics card is malfunctioning. In either case, it is recommended that you send it for repair.

The desktop computer boots up and shows no signal, which is generally caused by the fact that the graphics card is not detected, you can replug and unplug the connection cable between the monitor and the graphics card to see if it can be solved, if it still does not respond, pull out the graphics card and wipe the gold finger.

If there is no problem with the cable, it means that the host is not powered on, and the hardware problem needs to be detected.

Observe if the host is functioning properly. If the host is normal, then the data cable of the monitor is not connected. Or use the elimination method to replace it with a working monitor.

The monitor data cable can't be connected, disconnected, unplugged and plugged in again, or there is a problem with the graphics card, most of them are data cable connection problems.

This requires some hands-on ability and computer hardware to know, I guess you can't do it yourself, I won't be popular, find a friend who understands computers, or go to the computer city to repair.

The wiring contacts are not good.

Check whether the external wiring of the computer is connected, the wiring contact is not buried, the signal cannot be connected, and the signal cannot be transmitted, which will also lead to the occurrence of no signal failure after booting. Unplug and unplug VGA cables, power cables, data cables, and other connections, and check whether there are any problems with the connections.

The history of the development of computers:

1. The first generation of tube digital machine.

In terms of hardware, the logic element uses a vacuum tube, the main memory uses mercury delay line, cathode ray dull simple wave tube electrostatic memory, magnetic drum, magnetic core, and the external memory uses magnetic tape. In terms of software, machine language and assembly language are used. The fields of application are mainly military and scientific computing.

2. The second generation of transistor digital machine.

In terms of hardware, the application fields of operating systems, high-level languages and their compilers are mainly scientific computing and transaction processing, and they have begun to enter the field of industrial control. It is characterized by smaller size, reduced energy consumption, improved reliability, increased computing speed (generally 100,000 times per second, up to 3 million times), and a significant improvement in performance compared to the first generation computer.

3. The third generation of integrated circuit digital machine.

In terms of hardware, the logic components are medium- and small-scale integrated circuits, and the main memory still uses magnetic cores. On the software side, time-sharing operating systems and structured, scaled programming methods have emerged.

It is characterized by faster speed, and the reliability has been significantly improved, ** further declined, and the product has moved towards generalization, serialization and standardization. The application field began to enter the field of word processing and graphic image processing.

4. The 4th generation LSI machine.

In terms of hardware, the logic components are large-scale and ultra-large-scale integrated circuits. In terms of software, database management systems, network management systems, and object-oriented languages have emerged.

In 1971, the world's first microprocessor was born in Silicon Valley, ushering in a new era of microcomputers. The application field has gradually moved from scientific computing, transaction management, and process control to the home. <>

1. The characteristics of the data cable are poor, or the contact with the graphics card and display is not close. Check whether the external wiring of the computer is properly connected, and poor wiring contact will also cause no signal failure of the display after booting. Replug and unplug the VGA cable, vibrillation source cable, data cable and other cables to check whether there is a connection problem.

There is also a special case, that is, the display VGA cable is connected to the wrong position, and the machine with the discrete graphics card must connect the VGA cable to the interface of the discrete graphics card.

2. Check whether there is any excess metal in the chassis, or a short circuit caused by the deformation of the motherboard, smell whether there is a burning paste in the chassis, whether there are burned chips on the motherboard, and whether the capacitors around the CPU are damaged or not.

3. Dust is the first killer of computer failure, if the dust in the chassis is excessive, the memory, graphics card and slot are in poor contact, and the hardware is corroded. Therefore, it is necessary to clean the computer regularly. Clean the dust off the motherboard, wipe the gold finger with an eraser, and check if the computer is normal.

4. The power dissipation of the onboard power circuit of the motherboard decreases, which makes the power supply of the graphics card insufficient, and the filter capacitor in the onboard power circuit is seriously leakage, resulting in the voltage of the corresponding power supply circuit decreasing, and it will also cause the occurrence of no signal failure of the display after the computer is turned on. Unplug the reset cable on the motherboard and connect it with other switches and indicator lights, and then use a screwdriver to short-circuit the switch to see if it can turn on normally.

5. If you can't turn on the computer, use the minimum system method, unplug the data cable of the hard disk, floppy drive, and optical drive, and check whether the computer can be turned on. Then connect the above devices to the computer one by one, when connected to a certain device, the display after booting no signal fault reproduces, indicating that the fault is caused by this equipment, focus on checking this equipment.

6. Check the memory, graphics card, CPU, and motherboard. Use the plug-in method, swap method and other methods to check whether the memory, graphics card, CPU and other devices are normal, and replace the damaged devices if the devices are damaged.

7. If the memory, graphics card, CPU and other devices are normal, check the BIOS. 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 be displayed, then install the motherboard into the chassis for testing until the cause of the fault is found. If there is still no signal failure of the monitor after booting, you can only return the motherboard to the manufacturer for repair.

8. After the computer is turned on, the system BIOS starts to power on the self-test, and when it detects an error in a device in the computer, it will send out a sound to report the error. Therefore, there may be a failure of the display with no signal and alarm sound. If there is no signal and alarm sound failure on the display after the computer is turned on, you can check the faulty equipment according to the meaning of the BIOS alarm sound to eliminate the fault.

The system is broken, reinstall the system, try it, if it still doesn't work, change the hard disk, and it's OK.

Check if the graphics card is connected. Is there a problem with the graphics card driver?

It's obvious that the system is broken. Let's make a system.

1.If the mouse and keyboard light is not on, you can turn off the power cord of the host, and press the power switch on the host computer for 10 consecutive times with your hand to release the static electricity. If you have experience with chassis activation, re-inserting the memory module will usually solve the problem.

This kind of problem can basically be judged to be a problem with the motherboard and memory, especially the brand machine; If the motherboard and memory do not have normal self-check, it can usually be solved by re-inserting and removing the memory module, but if this problem occurs repeatedly and frequently, it is recommended to repair it, and the basic maintenance method adopted by the maintenance point or after-sales service is to replace the motherboard or memory.

2.If the mouse and keyboard light is on, you can plug and unplug the monitor data cable and power cable to troubleshoot. If there is a sound entering the system, the monitor is not displayed, you can also test it by the replacement method (the display is connected to other hosts), it is not ruled out that the display is faulty, first check the display interface and the display cable connecting the graphics card after the chassis is prepared.

Swap the memory module to someone else's machine and see if it's normal in a few days. Good luck!

There is no signal at boot, the motherboard is broken, if it can be used, the interface is broken.