The machine sometimes does not respond when it is turned on, and the display color is not normal, wh

How to troubleshoot the computer boot without display. Step 1: First check whether the external wiring of the computer is connected, and plug in each cable again to see if the fault is eliminated.

Step 2: If the fault persists, then open the main chassis to check whether there is any excess metal in the chassis, or a short circuit caused by the deformation of the motherboard, and 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. Step 3:

If not, clean the motherboard from dust and check if the computer is OK. Step 4: If the fault persists, unplug the reset cable on the motherboard and connect it with other switches and indicator lights, and then use the change cone short-circuit switch to see if it can turn on.

Step 5: If you can't turn on the computer, then use the minimum system method, unplug the data cable of the hard disk, floppy drive, and optical drive, and then check whether the computer can be turned on. Then connect the above devices to the computer one by one, when connecting a certain device, the fault will recur, indicating that the fault is caused by this device, and finally focus on checking this device.

Step 6: If the fault persists, the fault may be caused by devices such as memory, graphics card, CPU, motherboard, etc. Then, 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 there are damaged devices.

Step 7: 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, 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 the fault persists, you need to return the motherboard to the manufacturer for repair.

Step 8: When the computer is turned on without display but there is an alarm sound, when the computer is booted up, the system BIOS starts to POST (power-on self-test), when it detects a fatal error in a device in the computer, it will control the speaker to send out a sound to report the error. Therefore, there may be a fault that the power is turned on without displaying an alarm sound.

If the computer is turned on and there is no alarm sound, the fault can be checked according to the meaning of the BIOS alarm sound to check the faulty device to eliminate the fault.

What should I do if the computer turns on and the monitor has no signal? The solution is simple.

No, the monitor has been watched, the movie switch has a response when pressed, the display is shown to have no signal when the monitor is turned on, the movie switch has a response when it is pressed, and the display is displayed without signal Answer, then you can check the position of the monitor signal line of the computer host and the interface between the host computer and the host to see if it is loose. If the line is loose, reseat it; Or unplug the signal of the monitor, and check whether the interface and line of the signal cable of the monitor are damaged. If the interface and line are damaged, replace it with a new monitor signal cable.

The question changed the line, but it still didn't work.

Changed the line, but it still doesn't work.

The computer boot display does not respond.

The cable from the monitor to the host unit is not plugged in.

There is a "beep" sound when the boot is turned on, which means that the self-test has passed, and there is no problem with the memory, graphics card, etc.;

At this time, the screen is black, and the display light is flashing, saying that the obvious card signal is not received by the display;

There are two possibilities for this phenomenon, namely poor interface circuitry of the graphics card or display;

The landlord can separate the display from the host and check the display separately;

1. If the power of the monitor is turned on, it will display "no signal". Once connected, after rebooting, there is no display like "no signal", which means that the display has a fault of "cannot be connected", and the fault point is in the protection circuit of the display;

Generally, the output voltage of the display power supply is too high, which makes the anode high voltage of the picture tube high, which exceeds or approaches the starting value of the X-ray protection circuit and causes protection;

2. If "No Signal" is not displayed after turning on the power of the monitor, the monitor has one of the following faults:

1. There is intermittent vibration phenomenon in the switching power supply;

2. Poor characteristics of the switch tube;

3. There is an open circuit in the load part;

4. Clipping capacitor leakage on the secondary side of the high-voltage package;

5. The internal short circuit of the output transformer is provided.

6. The C pole of the row output tube is in poor contact with the row transformer;

7. Damping tube breakdown;

8. Reverse capacitor leakage, or failure.

The host is faulty, the memory is wiped with alcohol, and if it is not good, it is recommended to repair it.

If the hard drive is broken, the monitor will still display, please rest assured! According to lz, the monitor doesn't respond,My understanding is,The monitor's own boot screen is not displayed。 There are two possibilities for this scenario:

1. The display is broken; 2. There is a problem with the power supply of the monitor. If the monitor can show its own boot screen, but then it shows that there is no signal source, then please check whether the gold finger part of the graphics card is defective, and whether there is a hard injury on the graphics card. If it is not the above problem, then it may be a transmission line problem, and LZ can try to smear it with a pencil at the connection of the transmission line to enhance the conduction.

Check the following two paragraphs:

The display has no display, from two aspects: there is a problem with the graphics card to the display, there is a problem inside the host, if you can see the hard disk light flashing or hear the sound of entering the system after turning on the computer, or press numlock, the num key can be switched, it means that the host is fine, check the circuit from the graphics card to the display and the display itself, otherwise the host is not operating normally, but I just hear the host fan ringing, mistakenly thinking that the host is normal, of course, you can also change the monitor, if everything is normal, it means that there is a problem with the monitor. If you are sure that there is a problem with the host, you must ensure that the motherboard.

CPU power supply.

It is generally recommended to clean up the dust and reinstall the aforementioned boards, mainly the memory and graphics card, and at the same time, you must pay attention to whether the switch pops up normally, and whether there is metal in the motherboard that causes a short circuit and cannot be displayed. In the absence of tools, the first five can be replaced one by one with the appropriate hardware to determine which hardware is problematic.

The basic check method of the monitor has no signal, your monitor does not transmit signal, first see how the connection cable contacts, unplug and reconnect, and then change to other monitors to connect, to make sure that it is not a problem with the connection cable! Take down the external mouse, audio, graphics card, keyboard, monitor data cable, memory module, the remaining power supply, motherboard, CPU basic hardware connection, take down the CPU and turn on to see if the indicator light on the motherboard is on, this is to check the fault of the motherboard, it does not light up means that there is a problem with the motherboard, the next step is to install the CPU, turn on the computer to see if there is an alarm sound, there should be an alarm sound, if not, just change the CPU, indicating that the CPU has a problem, if there is an alarm, then the next step, add the memory module, Turn on the computer to see if there is an alarm sound, if the alarm sound is still the same, the problem is in the memory module, there is no problem with the memory module, to this internal hardware, after checking, you can use this method to connect your monitor, from your external graphics card, monitor, keyboard, mouse to find the problem, you can use the replacement method to try, such as the monitor, connect the data cable or graphics card to other computers, see if there is a signal.