It is a common fault that an assembled computer cannot turn on. There are many reasons for this problem, including hardware failure, power supply problems, BIOS setting errors, etc. In order to quickly solve this problem, PHP editor Strawberry specially brings you a detailed troubleshooting guide, covering common startup failures and corresponding solutions. This article will guide you step by step in troubleshooting and fixing problems so that your assembled computer can start up smoothly.
1. Measure whether the power supply can output various voltages normally. If there is no measuring tool, you can directly replace it with a good power supply. Check whether the connection between the power supply and the motherboard is reliable, and the 20-port plug can be unplugged and plugged in. Is the power switch on the panel damaged? If necessary, you can directly short-circuit the PWR SW connector on the motherboard to see if the motherboard can be started. After making sure that the power supply is normal, perform the following checks.
2. Unplug and plug in the CPU. If that doesn't work, replace the CPU. If it can start after unplugging and plugging in the CPU, it means the CPU contact is poor. It cannot start after unplugging and plugging in the CPU. The CPU may be damaged, so changing the CPU still doesn't work. The only thing left is the motherboard.
3. The first thing to check on the motherboard should be whether the CPU socket power supply is normal, followed by the south bridge, north bridge, each crystal oscillator, clock generator, etc. You can use the motherboard diagnostic card. Of course, these are not something ordinary DIYers can accomplish. Only sent for repair.
1. Measure whether the power supply can output various voltages normally. If there is no measuring tool, you can directly replace it with a good power supply. Check whether the connection between the power supply and the motherboard is reliable, and the 20-port plug can be unplugged and plugged in. Is the power switch on the panel damaged? If necessary, you can directly short-circuit the PWR SW connector on the motherboard to see if the motherboard can be started. After making sure that the power supply is normal, perform the following checks.
2. Unplug and plug in the CPU. If that doesn't work, replace the CPU. If it can start after unplugging and plugging in the CPU, it means the CPU contact is poor. It cannot start after unplugging and plugging in the CPU. The CPU may be damaged, so changing the CPU still doesn't work. The only thing left is the motherboard.
3. The first thing to check on the motherboard should be whether the CPU socket power supply is normal, followed by the south bridge, north bridge, each crystal oscillator, clock generator, etc. You can use the motherboard diagnostic card. Of course, these are not something ordinary DIYers can accomplish. Only sent for repair.
The analysis and solutions to the reasons why a newly assembled computer cannot be turned on are as follows:
1. There are poor contact problems in various internal components of the machine, such as the most common memory contact problem.
2. There is poor contact between the host and the monitor.
Solution:
1. First, observe whether there is poor contact between the host signal line and the monitor. 2. Turn off the computer and open the case. There is a long strip of equipment on the motherboard, which is the memory. If you look at it, there are two buckles on both sides. If you open it, you can take out the memory and reinsert it (note that it must be inserted in place). ), and then turn it on
1. If you enter the bios interface, first enter the bios interface to check whether the CPU temperature is too high. Generally, if it exceeds 70°, it is considered a very high temperature. This temperature is enough to cause a computer to freeze.
2. If the temperature is too high, it is recommended to disassemble the case and see if the fan is running normally. If not, you need to replace it with a new one. Then check to see if the heat sink is in good contact with the CPU. If not, reinstall it securely. Then check to see if the thermal silicone grease on the CPU is applied evenly. If not, re-apply it. Check to see if the CPU is overclocked. If so, reduce it. If you don’t understand the above, go directly to a computer repair station.
3. It may be that the installation of multiple anti-virus software causes the computer to crash after booting. The solution at this time: If you have an installation disk, enter the PE system and uninstall the anti-virus software in the PE system.
4, genuine system, caused by patching indiscriminately. Nowadays, various security guards are installed on the computer. Do they remind you of any security vulnerabilities, or fix them with one click during the security check? As a result, the software applies various incompatible patches to the computer in the background, causing the system to crash upon startup. The solution at this time: Restore the system. gost recovery, system reinstallation.
First check whether the host is powered on normally. Check whether the power supply from the power board is normal, and then check whether the chassis power supply is turned on. If it is turned on, you can see that the power supply fan rotates normally.
If the power does not turn on, check whether the cable of the chassis computer switch on the motherboard is loose or damaged. You can use a small metal to short-circuit the two power switch pins on the motherboard.
If the power supply starts up, consider that there is a problem with the switch and cable. If it still does not start up, consider that there is a problem with the power supply or the motherboard. You can replace the power supply or send it to a professional repair center to solve the problem.
The chassis power supply is working normally, but the CPU fan is still unresponsive. You can discharge the power to the motherboard, disconnect the power supply, remove the CMOS battery on the motherboard, and wait for about a minute until the power on the motherboard is discharged. Finally, buckle the battery, turn on the phone and try again.
The CPU fan is working normally, but the computer still does not turn on normally. Considering the poor contact between the memory and the memory slot, you can disconnect the power supply, unplug the memory module, and use a rubber eraser or clean white paper to wipe the golden finger until the golden finger If there are no stains on the memory slot, use a clean brush to brush the memory slot, blow it carefully with an air blower, and then insert the memory module.
The CPU fan is working normally, and the memory is also normal. It can be judged by a "beep" sound during normal startup, but the monitor still has no signal input. Considering that the graphics card is in poor contact or damaged, disconnect the power supply and remove it. Remove the graphics card, wipe the golden finger area clean, and use an air blower to blow away the dust in the slot, replace the graphics card, and turn on the computer again.
If there is still no signal input, check whether the VGA interface connected to the monitor is damaged or the VGA cable is damaged. You can try replacing a VGA cable.
Generally, the compatibility of slot 3 is not very good, so plugging 3 and 4 may cause incompatibility. The most compatible slot on the motherboard is slot 2. Taking MSI's Z390 motherboard as an example, it generally supports you to plug in 1, 2, and 4 (recommended 2 and 4). Slot 3 is generally less used
Why can’t I adjust the water-cooling fan of a newly assembled computer?
If you have a fan HUB, then you need to take one more step to test whether there is any problem with the HUB.
The iPad Pro you just bought can’t turn on?
If normal startup still doesn't work, try pressing and holding the home button + power button at the same time for at least 10 seconds until you see the Apple logo lighting up on the screen, even if the force restart is successful.
Why can’t the newly assembled host be turned on?
1, first unplug the computer power cord and press the power button on the chassis 5-6 times. Release the residual charge on the motherboard.
2, then open the side panel of the chassis, insert and remove the memory slots.
3. Remove the CMOS battery from the motherboard and reinstall it after 1 minute. If your computer has a separate graphics card, it is best to plug and unplug the graphics card. After completing the above operations, power on the computer again. If the problem still occurs, you still need to use the minimum system method to boot: (power supply + motherboard + CPU + memory + graphics card + monitor) At this time, you should normally see the display content, and a prompt such as the hard disk or keyboard cannot be detected will pop up. You can enter the bios, and the buzzer will not beep abnormally. Voice. If it is abnormal, the monitor has no display (or the screen is blurred) or the buzzer sounds abnormally. (1) Memory problem a. The problem itself. It doesn't work in any slot, nor on other machines. Then the only option is to replace the memory. The buzzer usually makes an abnormal sound. b. Compatibility issues. Other machines can be used, but not this one; or a single cord can be used, but two cords cannot be used. Replace the memory. (2) Monitor/graphics card problem a. Connection problem. Check whether there are broken needles or short circuits. b. The graphics card itself is damaged. c. The display is damaged (very unlikely) b. Motherboard problem. The graphics card slot or related control circuit is faulty. At this time, the only solution is to replace the motherboard.
The assembled computer cannot be started?
1. There are poor contact problems in various internal components of the machine, such as the most common memory contact problem.
2. There is poor contact between the host and the monitor.
Solution:
1. First, observe whether there is poor contact between the host signal line and the monitor. 2. Turn off the computer and open the case. There is a long strip of equipment on the motherboard, which is the memory. If you look at it, there are two buckles on both sides. If you open it, you can take out the memory and reinsert it (note that it must be inserted in place). ), and then turn on the computer.
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