The lights of the hard drive and power supply are not lit and cannot enter the system

1.Try a different CMOS battery.

2.Take a motherboard debug card to check if something is wrong.

3.Check if there is any problem with the power supply.

4.Check that the power cord is not loose.

5.Try a different motherboard.

6.Format the hard drive and change the hard drive cable.

7.Check the switch.

8.Plug all the wires back in.

9.The graphics card and memory are plugged in again.

10.Take it to the professional maintenance department for testing.

There are many reasons for this situation, but the most common ones are loose memory modules (generally there is a sound prompt, re-insert or change the position), CMOS power supply battery problems (if there is no power, you can replace it, this situation is generally easy to appear on old computers that are more than three years old), and the graphics card is not in sufficient contact with the motherboard (generally there is a sound prompt to plug in and dial).

Try changing the cable of the hard drive!

It has a certain relationship with the motherboard battery, but it is not all, replace the battery first!

The main thing is that the motherboard doesn't recognize the hard disk, if the battery is solved, it is the battery problem, if it is still the same, the motherboard has a problem!

There are two reasons for the suspicion;

1. Problems with computer power supply, unstable output voltage or reduced power. Try it with a different power supply.

2. The motherboard BIOS cannot save the correct configuration parameters. Change the motherboard's battery. Set the hard disk to auto

If the motherboard battery is out of power, replace the battery first. Try to find a hard drive to replace it, and replace the power supply after making sure the hard disk is okay.

There is a jumper next to the battery of the motherboard, short it, and the CMOS is clear. Or take the battery out and clear it. You can also.

Looking at the current problem, the machine has not passed the self-test, and it cannot be started at all. But you said that the CPU and the power supply fan are running normally, at least it means that the power supply is powered, and now the lights are not on, which is a bit magical.

It seems that there is a high possibility of a problem with the power supply, and it seems that the voltage is not enough, so try changing the power supply.

Is there an audible alarm? What's the reaction? Is the problem sudden?

The self-test sound wiring on the motherboard is not connected, it is recommended to connect it, according to the error sound to find the fault computer failure needs to find the cause through the elimination method, after all, it is not a phenomenon there is only one answer to the motherboard problem, CPU problem, power supply problem will cause you to find the above fault phenomenon It is recommended to find a power supply to replace it, if there is still a fault, check the CPU or replace the motherboard.

There is no alarm sound, because the maintenance person has unplugged your motherboard alarm horn.

Has the landlord tried to restore the motherboard CMOS settings, take out the motherboard battery for a while, and put it on the main to try it again.

Then observe how the machine reacts.

Send the reaction of the machine to you, and you can refer to it.

If the power supply is broken, it will not be powered on, maybe it is a problem with the motherboard, check whether the chip corner is desoldered or loose, it is recommended that you take it to the computer company for testing.

Is the hard drive spinning? Try reconnecting the data and power cables of the hard drive. If it doesn't turn at all, it should be a power issue.

It could be that something is wrong inside the host.