Pavilion 17 G121wm Black screen

[EstebanLago]

I bought a Pavilion 17 G121wm and I have the following problem.
Suddenly and for no reason, the screen goes black and neither the mouse nor the keyboard responds. I only have to remove it in this state, I have to close the lid, wait and open it, there the power button flashes and press and return to the home screen
What should you do to fix it?

[SAM11112]

Analysis and elimination of the cause of the failure: 1. Display The black screen is caused by the monitor's failure to work normally, such as the monitor's power cord, poor contact of the power plug (note: both ends are possible), the power switch is broken, the internal circuit of the monitor is faulty, etc. 2. Signal line The display used by the PC uses a 15-pin D-shaped plug connection. The 13th and 14th pins are horizontal and vertical synchronization signals. The display determines whether to turn on the filament and the high-voltage power supply channel by judging the presence of these two signals. At the same time, these two signals are used as the transmission signal of the display mode through the combination of the positive and negative polarity of the signal and the difference in the horizontal frequency. If the line and field signals are missing one, the power indicator of the monitor is green, but no image is displayed; if it is absent, the power indicator of the monitor is orange and no image is displayed. In this case, check whether the D-shaped plug of the signal cable of the display has broken pins, crooked pins or short pins, and the signal cable has broken wires. The solution is to replace the high-quality signal line. In the power management of the computer's CMOS settings, there is a "Video off Method" in which there are three options of "V/H SYNC+BLANK, Blank Screen, DPMS", the first of which is to select the graphics card to output line and field signals To control the energy saving mode of the monitor. 3. Graphics card The most directly related to the display is the graphics card. If the graphics card does not send out signals or cannot send out signals, the display will certainly not light up at this time. In actual use, the graphics card is not compatible with the motherboard, the signal output socket of the graphics card is not in good contact or loose, and the graphics card is damaged, and the graphics card and the AGP socket of the motherboard are not in contact, which will cause the display to not light up. To eliminate this kind of failure, you need to be careful and patient, and carefully check the contact between the graphics card and the motherboard to see if there is any unstable contact. For incompatibility, we can only judge based on experience and data. Four. Power Everyone always spends a lot of money on the CPU and memory when configuring the machine, but the power supply is always very expensive. However, the power supply is the source of power for all parts of the computer. If something goes wrong, will other parts still work? Everyone generally knows that if the power supply fails, the host will give a continuous short "di" alarm and the display will not light up. However, there was a time when there was no answer, but the final check was turned out to be a power supply problem. Five. Motherboard The main reason is that the CMOS settings are wrong. The first initialized graphics card is set to PCI or the onboard AGP graphics card, but the monitor is not connected to the corresponding position. As a result, the computer starts normally, but the monitor does not light up. Furthermore, the conflict of CPU, memory or graphics card, sound card, modem, and network card will also cause the host to fail to start and cause the display to black out. Six. Software conflict Due to the universal expansibility of PCs, PCs have extremely vitality, so they have created thousands of software companies and compiled countless application software for everyone. However, it is precisely because these different application software are made by Compiled by different companies, when they are installed together, it may cause a black screen of crash due to address call conflicts. , The most typical feature of this type of failure is that after installing a certain software, the system prompts to restart, after the self-check screen and the blue sky and white clouds of WIN98, only the cursor is blinking on the display screen, and then nothing happens. . The way to solve this kind of problem is also very simple. Just remember what software you just installed, hold down the "Ctrl" key during startup, select item 3 to enter the safe mode, and uninstall the software you just installed. Seven. Virus damage Viruses are extremely destructive, especially with the advent of the Internet era, more and more viruses spread through the Internet. Viruses that can cause a black screen on the display, such as viruses such as CIH, are extremely destructive, and directly rewrite the BIOS chip of the motherboard, causing the machine to not start at all and do not self-check. If there is no such tool as a programmer, your motherboard can only be scrapped. Sometimes it may be because the BIOS chip is broken by a virus, causing the maintenance personnel to misjudge and delay a lot of time. If the virus maker understands the working principle of the graphics card and controls the output of the graphics card through the program, it will also cause a black screen on the display, but generally it can only go black after entering the system. other: 1. When the monitor has a black screen and no image is displayed (but the current monitors on the market will display "no signal cable connection" when there is no signal from the host), first check whether the power supply of the host is well connected and whether the fan of the power supply is rotating? Are the power indicator and hard disk indicator on the panel of the host flashing on? This is because if the power supply of the host computer is not working or the motherboard is not supplying power, of course, there will be no image display when the display does not receive a signal. 2. Then check whether the power supply of the monitor is well connected? If the power switch of your monitor is a touch switch, when you power on the monitor, you should hear a slight "pop" sound. At this time, it can be judged that the switch power circuit of the monitor is good. Is the power switch of the monitor turned on? Is the power indicator of the monitor on? When you move your hand close to the monitor screen and slowly move it to see if there is a "sizzle" sound, and the hair on your hand feels like being sucked up, this is checking whether the monitor's high-voltage circuit is working properly. 3. If it is determined that the monitor is powered on and high voltage is generated, continue to check whether the data cable connector of the monitor is in good contact with the signal output interface of the graphics card? Is there any looseness? Then unplug the plug and check whether there is a bent or broken needle or a lot of dirt in the D-type interface. This is a problem that many users often encounter. When connecting the D-type socket, the force is uneven, or the fixing screw of the interface is forgotten to tighten, so that the interface is loose and the contact is poor, or the D-type is caused by improper installation method or excessive force. There are broken or bent needles in the interface, causing poor contact. Note: There may be missing needles on the 15-pin of the data cable plug of the monitor, such as 4, 9, and 11 pins. At this time, it is normal. Do not artificially use other wires to supplement these missing pins to avoid other failures. Let me say a little more: Pins 1, 2 and 3 are red, green, and blue signal inputs. If one of the pins is not in contact, the screen will lack the corresponding color. If there is a problem with the 12th and 15th pins, the host cannot find the corresponding display, but this does not affect the use. If there is a problem with the 13th and 14th pins, a black screen will appear on the monitor, and the indicator light of the monitor will turn from green to orange after a while after it is turned on. One of the aforementioned black screens also appeared. 4. Open the case to check whether the display card is installed correctly? Is it in good contact with the motherboard socket? Does the graphics card or slot accumulate too much dust due to long use time, and cause poor contact? Whether the chip on the graphics card is burnt or cracked. When the screen is black due to the graphics card, there will be a short and four long "didi" sound prompt when the computer powers on. When installing the graphics card, hold the upper part of the graphics card with your hand, and insert it evenly into the card slot, so that the fixing screw holes of the graphics card match the screw holes of the main chassis. Do not forcibly fix the card when it is not plugged in, which will cause the graphics card to distort. If you confirm that the installation is correct, you can remove the graphics card and wipe the golden fingers of the pins with an alcohol cotton ball or change a slot (only for PCI graphics cards) and install it. If it still doesn't work, you can only try a good graphics card. If it still doesn't work, you must also consider the compatibility of the graphics card and the motherboard when determining that the graphics card is in good condition. It's best to check relevant information or ask netizens. 5. Check whether other boards (including sound cards, decompression cards, and video capture cards) are in good contact with the motherboard slots? Pay attention to check whether the data cable of the hard disk and the power cable of the hard disk are connected correctly? Replace the slots of other boards and clean the pins. Many people tend to overlook this. It is generally believed that a black computer screen is a problem with the monitor and graphics card and has nothing to do with other devices. In fact, because the sound card and other equipment are not installed correctly, it is difficult to complete the initial system, especially if the hard disk data cable and the hard disk power cable are plugged incorrectly, it is easy to cause no display failure. 6. Check whether the memory stick is in good contact with the motherboard? Re-plug the memory module or try another slot, or replace with a new memory module. If there is a problem with the memory module, the computer will have a continuous and rapid beep when it starts. The beep will vary depending on the motherboard. 7. Check whether the CPU is in good contact with the CPU socket on the motherboard? Due to movement or other factors, the CPU is in poor contact with the SLOT1 socket or SOCKE370 socket. It is best to press the CPU with your hand or remove the CPU and install it again. 8. Check whether the jumpers of CPU external frequency, multiplier, memory frequency, etc. or the settings in CMOS are correct. Check the relevant jumpers one by one according to the motherboard manual, the order is "CPU external frequency jumper-CPU frequency multiplier jumper-memory frequency jumper". 9. Check whether the CPU voltage is set properly. Be careful when setting the CPU voltage jumper to match the operating voltage of the CPU. The eight and nine steps should be carefully checked when a black screen appears for some assembled machines or users who like to overclock. 10. Check whether the CMOS parameter settings are correct. If your computer is equipped with two graphics cards, what you set in CMOS is the first to initialize the PCI graphics card, and your only monitor is connected to the AGP graphics card, of course, the monitor will not light up. 11. Check whether the working environment required by the host and monitor meets? Whether the working voltage is normal, whether the ambient temperature is too high, etc. In addition to checking according to the above steps, you can also quickly locate the computer according to the working condition of the computer. For example, after turning on the power of the host, you can hear a beep to indicate the completion of the computer self-test. If the hard disk indicator flashes continuously at this time, It should be checked in the second to fourth steps. 12. If the monitor displays content during the computer startup process, but a black screen appears after loading the WIN98 screen, this is just a problem with the WIN98 system software. The above-mentioned inspection method is based on the fact that there is no electrical fault in the display itself, that is, the power indicator of the display turns from green to yellow after the host is turned on, but there is no image display on the black screen of the display. If the monitor still has no display after using the above steps, please ask a professional for repair.