1. The motherboard is short-circuited.
2. The memory stick is oxidized.
3. The power supply is cut off.
Turn on the computer. If it appears, you can't enter the system. The main engine has been running in cycles. Look at the keyboard indicator first. When the computer is turned on, the keyboard indicator will flash. If it doesn't flash, the motherboard is short-circuited. Need professional replacement or maintenance. If the keyboard light flashes. Then it is very likely that the memory stick has been oxidized. Open the shell, pull out the memory module and wipe it clean with rubber. Install the memory module, which can be turned on under normal circumstances. If you have tried the above two methods, but none of them work. You should check the power supply. Just replace the new power supply if necessary. The problem will be solved!
The computer motherboard is on, but it won't open. Just drop the plugs that can be plugged in one by one on the button. Most of them are loose.
There is voltage at the boot pin of the computer motherboard, but it will not boot. Turn off the startup power light when it is on:
1. Short-circuit the power supply whether it is normal or not. (The black-green, red-gray and black-gray parts of the power card head are connected together, usually 3-4 or 4-5 butt joint).
2. Whether it is 2. The CPU is loose.
3. Whether the memory is tightly inserted and whether there is dust in the slot.
The power indicator is off:
4. Does the motherboard cause short circuit when it is installed in the chassis? (The screws of the main board contact the iron oxide chassis, and several screws contact the current loop on the chassis indirectly.) Whether the north-south bridge and the main board are overheated.
What is the reason why the computer motherboard is powered on but can't be turned on? The computer startup monitor is not responding. There must be something wrong with the computer hardware. It is best to eliminate the problem by substitution. Judgment method: 1. Press the uppercase and lowercase keys on the keyboard to start the machine. When the light is on, it means that the hardware such as graphics card and monitor is faulty. 2. The keyboard light does not light up, indicating that it is a problem with memory, CPU, motherboard and power supply. Solution: 1, the keyboard light is not on. First, wipe the memory stick with a rubber, and check whether the gold finger of the memory stick has burnt marks. Replace the memory in the slot. 2. Check the capacitance and resistance on the motherboard to see if the capacitance is bulging and the motherboard is burnt, and clean the dust on the motherboard. 3. Remove the CPU fan, turn it on, and manually test whether the CPU has temperature change. If not, it means that the CPU is not working, or the motherboard is broken, or the CPU is not plugged in properly, and then the CPU is plugged in again. 4. Power supply problem. Although the power supply is connected, the motherboard cannot work normally. Try replacing the power supply. 5. The graphics card is loose or oxidized, the keyboard light is on, and the screen is not displayed. Wipe the gold finger of the graphics card with a rubber, and check whether the capacitance on the graphics card is bulging. 6. Minimize the test methods, leaving only the power supply, motherboard, CPU, memory, graphics card, keyboard and monitor, unplug all wires on other motherboards, and short-circuit the switch pins with a screwdriver. If it is normal, add the remaining hardware one by one until the cause of the problem is found. Tip: All operations should be closed. If you are not familiar with computer hardware, it is recommended to find professional maintenance personnel to deal with it.
Why does my computer motherboard have power but can't be turned on? If it is new, change the motherboard. It is very likely that there is a problem with the power supply of the motherboard. If it is an old motherboard, it can be repaired. Maybe 20-30 yuan.
There is electricity on the computer motherboard. The switch is not broken. I can't turn on the computer. I can't handle it because I don't know the details. It is suggested to spend more than 20 yuan to buy a computer test card, find the corresponding words according to the numbers, or spend money to repair or replace the computer. CPU memory, hard disk, motherboard and power graphics card are all close to the black screen.
Where can Shishi repair the computer motherboard? If the main power supply is not broken, I can't open the fifth floor of Dehui ~
Look at any one.
Or I can ask a friend to help you look at "135.99 Army".
The switch on the computer motherboard is red. It keeps ringing, but it won't open. The computer can't boot into the system. There are two situations: there is a hardware problem in the self-test, and the self-test can't enter the desktop, which is a system or driver problem.
1. Self-check can pass, but it cannot enter the desktop. This is an operating system or driver problem:
Why can't the computer normally enter the desktop or crash the blue screen after repeated restarts?
In the case of virus removal, it is generally due to the installation of GHOST version or other modified versions of the operating system, because a large number of drivers that are not suitable for your hardware devices are integrated in advance, which leads to the system being unable to correctly identify and load the necessary hardware devices of the system.
This error can be corrected by downloading and installing the original mirror version of the operating system and installing all drivers certified by Microsoft WHQL.
If you don't want to reinstall, you can try to open F8, enter the safe mode to uninstall the incompatible drivers of hardware devices (that is, right-click the device in the device manager) > Properties > Presence > Digital Signature Program >: drivers of Microsoft Windows hardware compatible publishers), automatically identify the hardware devices after starting, reinstall the downloaded drivers (WHQL) that have passed the Microsoft digital signature authentication, and then restart the computer again to see if there are any improvements.
Then there is software with duplicate functions in the system, causing conflicts (for example, two or more software killers and firewalls are installed, and advertisements are blocked).
If it is confirmed that it is not a system or software problem, you need to test the hardware in the following order: first, memory is the most likely, then CPU, then hard disk, and finally graphics card. There will be basically no blue screen on the motherboard.
In addition, check whether the machine is overheated due to poor heat dissipation (if it is, it is necessary to install a stronger radiator, repaint the heat dissipation paste and replace the high-power fan).
Check whether the top of the motherboard capacitor is convex (if convex, it must be replaced immediately).
It also depends on whether the output voltage is unstable due to insufficient power supply of the chassis (if so, it must be replaced immediately).
If the power-on self-test fails and you can't hear a click, it must be a hardware failure. It is necessary to make a preliminary judgment through the alarm sound of the small horn (buzzer) in order to narrow the scope of hardware failure. Please refer to your motherboard manual for the specific meaning of power-on alarm sound.
2. If the self-check fails, it must be a hardware failure:
What should I do if I don't hear the "ticking" sound after starting the computer?
After the computer started, the self-test failed. If you don't hear the dripping sound, it must be a hardware failure.
Exclusion inspection requires the following aspects:
1. The system time cannot be dBIOSplayed and saved correctly, which is caused by insufficient battery power on the motherboard. This kind of fault can be solved by replacing the new motherboard battery and pressing DEL key to reset the correct system time.
2. Check whether the motherboard capacitor bulges or leaks. If so, please go to a professional computer repair place to replace the motherboard capacitor.
3. Unplug the memory stick, wipe the golden finger with an eraser and plug it back in.
4. Reconnect all hardware and connecting wires firmly to avoid virtual connection.
5. Open the chassis and start it once to see if the fan is working normally. If it is not normal, please replace it.
6. Check whether the power supply of the chassis is insufficient, and replace it if there is a replacement power supply at hand.
7. Whether there is a hard disk failure will lead to bad track. Check the BIOS to see if the hard disk can be recognized.
There is no signal on the display, so it is important to check the connection of the display part. The black screen or flower screen of the monitor may be the problem of the graphics card or the monitor itself.
9. According to the alarm sound of the small horn (buzzer) of the boot chassis combined with your specific BIOS preliminary judgment, so as to narrow the scope of the problem. Please refer to your motherboard manual for the specific meaning of alarm sound.
10. That's all I can think of for the time being. Other parts are also checked step by step by substitution method or minimum load method.
The computer motherboard is broken and can't be turned on! It won't cost much if the power supply circuit is broken. If I/O burns, it will be in trouble. If it can be guaranteed, it can be replaced.
The tablet computer you just bought has electricity, but it won't turn on. Why do you ask? Unless it won't be turned on or there is something wrong with the operation.
Go directly to the seller or after-sales! The sooner the better, the product quality problem.
Even if it is your own operation, you should ask!