If you are sure that there is nothing wrong with your monitor cable connection, then the problem usually lies in the main computer chassis. The power supply, CPU and video card fan in your host computer must be turning after booting, indicating that the power supply is ok. Then you can listen to whether there is a "tick-tock" sound in the chassis when you just turn it on. This step is a memory self-test. Only with this sound can your computer enter the system. If not, you can wipe the memory stick with rubber or soft dry cloth (that is, the gold finger at the bottom of the memory stick), and the memory stick is on the motherboard.
The above is a common situation that the computer does not turn on, and it is also something you can usually solve. There are many reasons for this problem, such as the graphics card is not plugged in or broken, the motherboard is faulty, and the power supply is faulty. If the above situation does not exist or does not work after treatment, it is still recommended to take it to a computer repair shop for maintenance personnel to test.
2. Why can't the computer be turned on when the host is yellow and the display screen doesn't respond?
When the computer is turned on, the host light turns yellow, the display screen is unresponsive, and the computer cannot be turned on. Please follow these steps to solve the problem:
A. Check the memory, take it out, wipe the pins with rubber, and insert it into another slot for debugging. If there are more than two memories * * *, please use only one memory for debugging.
B, check the video card, check whether the video card is plugged in, take it out and use an eraser to check the pins, and then try the machine again. Then unplug the connection between the video card and the monitor, and try the machine again to see if it will enter the next self-test. If possible, try replacing the video card.
C, check the motherboard, first take the motherboard out and put it on an insulated plane (such as books or glass), because sometimes the chassis deformation will cause poor contact between the motherboard slot and the board card. Check whether there is any foreign matter in each slot of the motherboard and whether the gear is oxidized and discolored. If you find that one or two gears are different in color from other gears, it must be caused by oxidation or dust. Please scrape off the gear surface with a knife, then plug in the circuit board before debugging. Then check whether the wiring between the motherboard and the buttons is normal, especially the hot start button. Finally, try to reset the BIOS by discharging. The method is to remove the button cell from the motherboard, and then install it five minutes later, or directly install the battery backwards for two seconds, and then try the machine to see if it is normal. If possible, try replacing the motherboard.
D, check the CPU, if it is caused by CPU overclocking, then resetting the above BIOS should solve this problem, if it is not overclocking, then check whether the fan is normal, if it is not, try replacing the CPU.
E, the power supply is not good also can appear this kind of phenomenon, conditional try to replace the power supply.
3. The computer can't be turned on, and the host shows a yellow light.
Step 1: First, check whether the external wiring of the computer is connected properly, then plug in all the wiring again to see if the fault is eliminated.
Step 2: If the fault still exists, then open the main chassis to see if there are any redundant metal objects in the chassis, or if there is a short circuit caused by the deformation of the motherboard, and smell whether there is a burning smell in the chassis, whether there are burnt chips on the motherboard, and whether there are damaged capacitors around the CPU. Step 3: If not, clean up the dust on the motherboard, and then check whether the computer is normal.
Step 4: If the fault still exists, unplug the reset line and other switches and indicator lines on the motherboard, and then short-circuit the switch with a screwdriver to see if it can be turned on. Step 5: If you can't boot, unplug the data cables 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, 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. Step 6: If the fault still exists, it may be caused by memory, graphics card, CPU, motherboard and other equipment.
Then, check whether the memory, graphics card, CPU and other equipment are normal by plug-in method and exchange method, and replace them if they are damaged. Step 7: If the memory, graphics card, CPU and other devices are normal, then discharge the BIOS, put the motherboard outside the chassis in isolation mode, and connect the memory, graphics card, CPU and so on for testing. If the computer can display, then put the motherboard into the chassis for testing until the cause of the failure is found.
If the fault still exists, the motherboard needs to be returned to the manufacturer for repair. Step 8: The computer is turned on, but there is an alarm. When the computer is turned on, the system BIOS will start POST. When the device in the computer detects a fatal error, it will control the speaker to make a sound to 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.
4. The computer host lights up yellow. What if I can't open it? The monitor is also yellow. what can I do?
There is something wrong with the main power supply. Please check whether the power socket is normal and the power cord is normal.
2. If there is a problem with the power supply of the chassis, please check whether there is a standby voltage of 5 volts and whether the connection between the motherboard and the power supply is loose. If the voltage cannot be measured, you can find a power supply to change it.
3, the motherboard problem, if the above two are no problem, then the possibility of motherboard failure is relatively large. First check whether the connection between the motherboard and the power-on key is loose and whether the switch is normal. You can try to short-circuit the switch with wires. If not, we have to try to change the motherboard. (Note: Try to find a motherboard with the same model or chipset, because other motherboards may not support your CPU and memory. )
5. What is the yellow light on the display screen after the computer is turned on?
Several reasons why the computer can't be turned on
Common faults:
First, the boot host does not display, and there is no alarm.
Second, the boot monitor still does not display, and there is an alarm.
Third, after entering the windows xp startup interface, it will be restarted repeatedly.
Fourth, the blue screen
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Common fault analysis and solutions;
A, can't boot and no alarm maintenance ideas:
The biggest possibility is that it can't be started, and there is no alarm fault. The most doubtful thing is: 1. Power supply; 2.CPU3. motherboard. Because as long as one of these three pieces of hardware is faulty, the motherboard will not start, and the motherboard will not alarm if it is not started. The failure is not necessarily the failure of accessories, but also the failure caused by poor contact.
ALT+F4 patent, plagiarism is shameful.
So check according to the following steps:
1. Measure whether the power supply can output various voltages normally. If there is no measuring tool, you can directly change to a good power supply.
Whether the power supply is connected to the motherboard reliably and whether the 20-port plug can be plugged in. Whether the power switch on the panel is damaged. If necessary, you can directly short the PWR SW pin on the motherboard to see if you can start the motherboard. After ensuring that the power supply is normal, carry out the following inspection.
2. plug in the CPU. If not, change the CPU.
It can still be started after unplugging the CPU, indicating that the CPU is in poor contact. After plugging in the CPU, it can't be started, and the CPU may be damaged, so changing the CPU or changing the CPU is still not enough, and the only thing left is the motherboard.
3. The first choice for motherboard inspection should be whether the power supply of the CPU socket is normal, followed by the south bridge and the north bridge, the crystal oscillator and the clock generator. You can use the motherboard diagnostic card. Of course, these are not what ordinary DIYER can do. We must send it to be repaired.
ALT+F4 patent, plagiarism is shameful.
Second, the common computer boot alarm sound and its solution (click)
If it is a memory problem: the memory is not plugged in properly, unplug the memory card and polish the golden finger with an eraser, otherwise the memory will be broken.
Other questions:
1. The video card is not plugged in tightly.
2. Check whether the monitor is damaged.
3. Plug in all the wires on the motherboard again.
4. Reinsert PCI, AGP or other connection cards.
Third, it may be that the system startup file is damaged or the hardware has been replaced.
1, the display resolution is adjusted, and the graphics card driver is uninstalled in safe mode, that's all.
2. The startup file is damaged.
3. My solution to this situation is: First, press F8 when turning on the machine, and an interface will appear for you to choose to enter the safe mode. First, select "Last Correct Configuration", if not, then select "Safe Mode", where you can reinstall a hardware driver and so on. Otherwise, the system startup file will be damaged.
4. The system startup file is damaged. It is also possible that someone deleted something during antivirus, and the system could not be started as a result. Then you can use the repair function of XP startup disk to boot, select the CD to boot in the BIOS and put it in. Press r key to get XP maintenance desk.
ALT+F4 patent, plagiarism is shameful.
Fourth, the blue screen
There are many reasons for the blue screen, including hardware, software and other imperceptible factors, and there are many solutions. Let's analyze what happened to you. The blue screen usually appears when the system is started and shut down for the following reasons:
1, the remaining space on the hard disk is too small or there are too many fragments: it is necessary to ensure that a certain amount of disk space is reserved, and the fragments should be sorted by computer every once in a while;
2. System hardware conflict: The "blue screen" caused by this phenomenon is also common. What is often encountered in practice is the setting conflict of sound card or video card. Check whether there are any devices with yellow question marks or exclamation marks in the control panel → System → Device Management. If so, please try to delete it first, and then restart the computer. If not, you can manually adjust or upgrade the corresponding driver;
3. Load too many programs at startup: Don't load too many applications at startup to avoid running out of system resources;
4. There are bugs in the application: some errors or unstable factors in using the program will also cause blue screens;
5. Attacked by unknown programs or viruses: you can check carefully and take preventive measures;
6. Version conflict: Some applications need to call a specific version of the dynamic link library DLL. If the old version of DLL overwrites the new version when installing the software, or the useful DLL file is deleted by mistake when deleting the application, the above call may fail, resulting in a "blue screen". Try reinstalling.
7. Error or corruption in the registry: In many cases, this is the main reason for the "blue screen". The registry stores important data, such as system hardware configuration, application settings and user information. If the registry is wrong or damaged, a "blue screen" may appear.
8. Incompatibility between software and hardware: New technologies and hardware are developing rapidly. If new hardware is installed, "blue screen" often appears, which is mostly related to the old BIOS or driver of the motherboard, so that it can not support the hardware well. If your motherboard supports BIOS upgrade, you should upgrade to the latest version or install the latest device driver as soon as possible.