Computer Black Screen Solutions Daquan

Computer is the most troublesome problem, not black screen is blue, but also a lot of English words, let people do not know, still have a master for us to share the difficulties

The reasons for the computer black screen are divided into eight main categories as follows:

(1) The monitor power off, or the monitor data line contact is bad. In addition the computer used too long display power cord easily oxidized and damaged;

(2) The motherboard has no power supply;

(3) Bad contact or damage to the graphics card;

(4) Bad CPU contact;

(5) Bad contact of memory bar;

(6) The machine is infected with CIH virus, the BIOS is refreshed by destructive;

(7) Check the Plug and unplug, if necessary, such as the use of rubber to clear the gold finger on the oxide film;

(8) If the floppy drive has a floppy disk, a lot of times will cause the computer to boot or restart when the computer will appear black screen, and can not enter the system. To avoid such cases, you can also cancel the floppy disk boot entry in the BIOS.

Computer Black screen Solution analysis:

For the computer black screen processing is basically the elimination, replacement of the combination of methods, the principle should be in line with the first to replace the most suspicious parts. For ordinary computer users, the lack of expertise, you can follow the following steps to analyze the cause of the failure, so that you can do their own troubleshooting.

First check whether the contact is good. You can check the video card and monitor the contact between the good, the graphics card and the motherboard I/O slot contact is good, if necessary, it can be removed, re-installed, to ensure that the installation in place, good contact.

If the contact is not a problem, it is best to try a different monitor to determine if the monitor is not a problem.

If the monitor is not a problem, check whether the CPU fan is working, such as running, using a multimeter to measure the voltage output is normal for ±12v, ±15V, if not normal can be replaced by a power supply to try.

If the black screen still appears, remove the components installed in the computer, leaving only the CPU, video card, memory, you can limit the cause of failure in the CPU, motherboard, memory three. Generally if the memory is faulty, there should be an alarm sound. If a memory failure is excluded, only the CPU and motherboard are available.

Replace a normal CPU (should be compatible with the detected computer), power-on re-detection, such as still appear black screen, you can only change a motherboard, the problem should also appear on the motherboard.

Computer black screen failure may indicate that the computer has more serious problems, it may be possible to appear in the black screen phenomenon in accordance with the above method to be excluded. In the process of processing should be flexible application of the method of elimination, replacement for the timely occurrence of the phenomenon to be excluded from processing.

1. When the monitor black screen does not have the image display (but the current market display in the host does not send the signal, the screen will display "No Signal line Connection"), first check the host power is plugged in good, the power supply fan is rotating? Power indicator on the host panel, hard drive indicator light is flashing? Because if the host power is not working or the motherboard does not have power, the monitor will not receive the signal, of course, there is no image display.

2. Check that the monitor's power is plugged in well? If your monitor's power switch is a light touch switch, when you add power to the display, you should hear a slight "tap" sound, you can judge the display switch power supply circuit is good. is the power switch on the monitor turned on? Is the power led on the monitor on? When the hand is close to the monitor screen and slowly move whether there is a "hissing" sound, while the hair on the hand has a feeling of being sucked, this in check the monitor high voltage circuit is working properly.

3. If it is determined that the display has been plugged in and has high pressure, continue to check that the monitor's data cable connector and the video card signal output interface is good contact? Do you have any loosening? Then unplug the plug to check if there is a bent or broken needle in the D-connector or a lot of dirt. This is a lot of users frequently encountered problems, in connection with D-type socket, force uneven, or forget to tighten the interface of the fixed screw, so that the interface loose caused by poor contact, or due to improper installation method or force too large, so that the D-type interface has broken needle or bent needle, resulting in poor contact.

Note: The data cable of the monitor plug of 15 pin may have missing needle, such as 4,9,11 needle, then normal, do not artificially use other wire to supplement these missing needle bit, lest cause other malfunction.

Say a little bit more: the needle is red, green, blue three shots signal input, if which needle contact is not good, the screen will be missing the corresponding color.

If the 12th, 15 pin has a problem, the host will not be able to find the corresponding monitor, but this does not affect the use.

If the 13th, 14-pin problem, the display will appear black screen, the indicator light on the monitor after the boot from green to orange. Also appeared in one of the above black screen.

4. Open the chassis to check that the monitor card is installed correctly? Is it in good contact with the motherboard slot? is the video card or slot too dusty for too long to cause contact? The chips on the graphics card are burnt and cracked. When the video card causes a black screen, the computer post with a short four-long "beep" sound hint. When installing the display card, you should hold the upper part of the display card by hand and insert the card slot evenly and firmly so that the fixed screw port of the video card matches the screw port of the main box. Do not force fixed when not plugged in, resulting in distorted graphics. If you are sure that the installation is correct, you can remove the video card with an alcoholic cotton swab to wipe the pin's gold finger or replace a slot (only for PCI graphics) installation. If not, you can only change a good video card to try.

If not, consider the compatibility of the graphics card with the motherboard when determining if the graphics card is intact.

5. Check that the other cards (including sound card, decompression card, video capture card) are in good contact with the motherboard's slot? Note Check that the data cable of the hard drive is correct for the power cord connection of the hard drive? Replace the slots of other cards and clean the pins. This is a point many people tend to overlook. It is generally believed that the computer black screen is a display and graphics problem, independent of other devices. In fact, because the sound card and other equipment installation is not correct, resulting in the initial system is difficult to complete, especially the hard disk data cable and hard disk power line interpolation error, easy to cause no display of the fault.

6. Check that the memory bar is in good contact with the motherboard. Reseat the memory bar once or replace the slot and try the new memory. If there is a problem with the memory bar, the computer will start with a continuous "beep" sound. The beep will vary depending on the motherboard.

7. Check that the CPU is in good contact with the CPU holder on the motherboard. Due to moving or other factors, the CPU and the SLOT1 socket or SOCKE370 outlet contact bad. It is best to press the CPU by the hand or remove the CPU and reinstall it again.

8. Check the CPU FSB, octave, the frequency of memory, etc. jumper or the setting in CMOS is correct. Check the relevant jumpers in the order of "CPU FSB jumper-CPU jumper-memory frequency jumper" against the motherboard manual.

9. Check that the CPU voltage is set appropriately. Be careful when setting the CPU voltage jumper, and be sure to match the operating voltage of the CPU. Eight and nine of these two steps for some assembly machines or like overclocking users should be carefully examined when a black screen appears.

10. Check that the CMOS parameters are set correctly. If your computer has two video cards, you set the first PCI graphics card in the CMOS, and your unique monitor is attached to the AGP card, of course the display will not be lit.

11. Check whether the operating environment required by the host and monitor is in accordance with the operating voltage is normal, the ambient temperature is not too high. In addition to the above steps to check, but also according to the computer's working condition to quickly locate, such as the power on the host, you can hear the "beep" to the completion of the computer self-test, if the hard disk light is flashing continuously, then the second to fourth step check.

12. If the display is displayed during the computer startup process, only when the screen appears black after loading the WIN98 screen, this is just a matter of WIN98 system software.

The above check method is based on the display itself without electrical failure, that is, the power supply led on the display from green to yellow but the display black screen no image display. If the display is still not displayed using the steps above, you should ask for professional maintenance.