When the computer is started, the main unit light will turn off as soon as it is turned on, and the

Remove the motherboard battery, discharge the CMOS, then put the battery on, power it up and restart.

It should be a problem with the power supply, replace a power supply.

The power supply is broken, you can change the power supply and see.

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Dear, I'm glad to answer for you: the computer host can not be started when it turns on and off, and when the system does not respond, do not panic, this may just be the phenomenon of fake death of the computer, which does not mean that the computer is broken.

The computer host can't be started when it turns on and off.

Dear, Zhao Zhao is happy to answer for you: the computer host can not be started when it is turned on and off, and when the system is silent, don't panic, this may be just the phenomenon of the computer's fake death, which does not mean that the computer is broken.

Start it up and go off again.

Method Steps: 1. First press the power switch button for up to 10 seconds to completely shut down the host, and then try to restart the computer to see if the fault is solved. 2. If the fault problem still exists, it may be caused by the instability of the power supply voltage, you can observe whether other electrical appliances can work normally, if other electrical appliances can work normally but the computer cannot work, then continue to see the next step.

3. The main engine cannot be turned on due to loose memory. Cut off the power of the host, try to unplug the memory module of the host, wipe the imitation gold finger with an eraser, and after reinstallation, turn on the machine to observe whether the fault is solved. 4. The motherboard static electricity will also cause the inability to open the wheel of the machine, at this time, you can try to remove the CMOS battery of the motherboard motherboard, use a metal object to shorten the CMOS battery pins, after discharging, reinstall the power supply, and then turn on the computer to try whether the fault is solved.

Reasons why it can't start:

1. First determine whether there is a signal in the serial data line between the display and the host.

2. Poor memory contact can also cause failure to boot, if it is dual-channel.

You can use memory sticks one by one.

to confirm whether the memory is bad.

3. If your computer monitor is connected to the motherboard's discrete graphics card, make sure the graphics card is really fine. The fan of the graphics card just means that it has been powered on, and the graphics card will turn as long as it is powered on, which is normal. Smell the graphics card, display chip, and capacitor for the smell of burnt.

Workaround:1Contact the motherboard manufacturer to replace the COMS chip with a new one, or find the BIOS file provided by the motherboard manufacturer and write it to the burner.

2.Check if the CPU is installed correctly, check if the CPU core is damaged, use the replacement method to check if the CPU is damaged, and replace the CPU if it is damaged.

3.Buy the lithium battery of CR2032, replace the existing battery on the motherboard to complete the self-test normally, and then reset the BIOS parameters.

4.Correctly connect the CPU fan to the motherboard's power connector, and make sure that it is connected to the CFAN's three-core dedicated CPU fan connector next to the CPU.

5.Check the gold finger of the graphics card.

Whether it is oxidized or there is a lot of dust in the AGP interface causing a short circuit, wipe the gold finger with an eraser, and use a leather tiger.

Clean up the dust in the AGP interface. At the same time, use the replacement method to rule out the problem of damaged graphics card, if the graphics card is damaged, replace the graphics card.

6.First check the cheats, memory slots, chips, and PCBs for burnout marks, and if so, it is recommended to replace the memory. If it doesn't, use the eraser to nudge the gold finger and reinsert the memory slot.

7.Replace the IO chip through the manufacturer and check the keyboard interface circuit.

8.Replace the case with a good quality and install the components with standard accessories.

9.Sometimes the power and reset of some poor quality cases are easy to get stuck inside or short-circuit inside, causing the keys to be connected all the time, and the state of repeated boot or reboot, resulting in the illusion that the boot cannot be turned on.

Check whether the main power switch is in poor contact, adjust the startup and restart jumper on the motherboard, or immediately unplug the startup jumper, and use a screwdriver to immediately short-circuit the double pin. If the common fault is eliminated, that is, the start button is broken, you can deal with it by spending some money to buy a wired power switch to replace it.