Why doesn t it work after pressing the restart button on the computer?

Judging from the above description, there is no response when you press the on/off button, and the following reasons can be considered:

1) The first reason: first look at whether the power cord is not plugged in properly, resulting in no power input to the computer. Solution: Re-plug the socket of the power cord or replace the socket.

2) The second reason: the power cord of the host is burned out, and it cannot be turned on without power input. Test the voltage with a multimeter (or electric pen), if it is not at the normal voltage of 170 240V, too low or too high, it means an open circuit or a short circuit.

Solution: Replace the power cord.

3) The third reason: is the problem of the power supply, due to the fuse of the power supply burned out, the rectifier diode is damaged, the switch triode breakdown, the main transformer is damaged, the filter capacitor is exploded, and so on, it may lead to failure to boot, boot no response, detection and treatment method: open the host, find the plug-in of the motherboard and chassis panel, remove the motherboard power switch pin wire (power sw), and the pins on the motherboard are:

PWR SW or PS On, two small square-ended steel needles (as shown below), and then use a slotted screwdriver to short these two pins, if the host power supply will turn, this means that the power supply is normal, if it will not turn, it means that the power supply is broken, and it can be replaced.

Common fault diagnosis methods for motherboards:

The structure of the computer motherboard is relatively complex, the failure rate is relatively high, and the fault distribution is also scattered. According to the source of the fault, motherboard faults can be divided into power supply faults, bus faults, component faults, etc. The main causes of motherboard failure are as follows:

1. Component reasons: The quality of chips and other components on the motherboard is not good, resulting in aging and damage to the motherboard, resulting in motherboard failure.

2. Human reasons: When using the computer, hot-swap the hardware at will or touch various connectors with metal objects indiscriminately, resulting in the failure of the motherboard.

3. Dust and static electricity causes: due to dust or static electricity, the motherboard is in poor contact, short circuit or burns the chips on the motherboard, resulting in the failure of the motherboard.

Causes of poor contact: Poor contact of various chips, sockets, and interfaces in the motherboard due to rust, oxidation, weakened elasticity, pin desoldering, breakage, etc., resulting in motherboard failure.

The computer can't turn on after pressing the reset button, follow the steps below to solve it:Check whether the monitor and the main unit cable and connector are connected; 2.If the external monitor sees that the system has started normally, then you can check whether the switch button above the keyboard for turning off the power supply when the display is closed is normal; 3.

If the external monitor and the pop-up display power-off switch are all right, the monitor cannot display the attack, then it may be a system problem; 4.If you are unconditionally connected to an external monitor, please reboot it and pay attention to whether the display screen is black at the beginning of the system boot in the DOS boot state. If the DOS also shoots the pants black screen when booting, and there is no normal self-test sound, it is mostly a system failure; The startup disk may be set up incorrectly.

Solution: Modify the hard disk mode. Boot and press F2, F10, F12 Delete (depending on the motherboard) to enter the BIOS, and set the first boot disk as a CD, floppy disk or U disk, and change it to a hard disk. 6.

HDD MBR error can be reset with DiskGenius; 7.Check whether the optical drive, USB flash drive, floppy disk, etc. are inserted, if so, you can take them out and try to turn them on; 8.Enter the BIOS, modify the hard disk mode, set different modes and try to restart to see if it can boot; 9.

Press F8 to enter the mode, and select the latest correct configuration or normal startup 10If none of the above methods can be solved. For desktop computers, please disassemble the case, unplug the hard disk cable and reconnect it, and then see if it can be started; During the boot process, listen to and touch the hard disk with your hands to see if the rotation is normal; 11.

The one-size-fits-all approach: reinstall the system.

Summary. There are several reasons for this:1

Power failure - Your computer's power supply is out of order, and you may need to replace the power supply or check that the power cord is properly connected. 2.Internal Component Failure - In more expensive cases, internal component inspections may be required.

3.Boot Device Failure - A boot device such as a hard drive may be faulty and needs to be replaced or repaired. 4.

Wrong BIOS settings - If the BIOS is set up incorrectly, it will also cause the computer to fail to turn on. The problem can be resolved by resetting or resetting the BIOS. If you are satisfied with me, please like and follow me, and you can get a chance to ask questions one-on-one.

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You've done a great job! Can you elaborate on that?

There are several reasons for macro travel:1Power Failure - If your computer's power supply fails, you may need to replace the power supply or check that the power cord is properly connected.

2.Internal Component Failure - In more expensive cases, internal component inspections may be required. 3.

Boot Device Failure - A boot device such as a hard drive may be faulty and needs to be replaced or repaired. 4.Wrong BIOS settings - If the BIOS is set up incorrectly, it will also cause the computer to fail to turn on.

1. First confirm whether there is a problem with the power contact, that is, confirm whether the plugs are plugged in, if they are not plugged in, that is, there is no power, then it will not be able to turn on.

2. Then we unplug the power cord behind the host, press the power button 5-10 times repeatedly, discharge static electricity, and then plug the power cord back in, and press the power button after the boredom to see if it returns to normal. In addition, if the yellow light is on, it means that there is power, so please try to switch the power cords between the main unit and the monitor.

3. When pressing the power button, you will generally hear a ticking sound, if not, it is likely to be stuck or the lever is broken, and we need to disassemble the shed and replace one.

4. Also see if there is friction in the keycaps, if there is friction, we need to add some lubricant, if it is a switch problem, you can swap the switch and the restart switch, open the computer case, find the switch plug and the restart switch plug according to the lead after the opening and bending of the panel, the two plugs can be swapped, but you have to use the restart switch to turn on in the future.

5. Then we unplug the power switch on the front panel and the connection cable of the motherboard, touch the power switch on the motherboard with a screwdriver or a screwdriver, if it can be started, it means that there is a problem with the switch on the front panel. If it doesn't boot, there may be a problem with both the power supply and the motherboard. Generally, when we touch the motherboard, it can basically be booted, and the probability of not being able to boot is relatively low.

6. Finally, we carry out power supply testing, unplug the widest cable plugged into the motherboard, prepare a wire to short circuit the green wire and any black wire, and then plug in the power supply, if the power supply fan is working, then the power supply is good, if it does not work, this is a power supply problem. Replug the power input to the motherboard, turn on and try again, and this problem can often be solved.