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.
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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.
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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.
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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. Usually, the blue screen 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.