Several computers have changed hardware, and the machine can t be turned on 15

Several machines do not work.

Eliminate the possibility of plugging in the wrong CPU.

Most of the CPU burned out, and there must be something wrong with the motherboard of the first broken machine.

Because as long as the power supply part of the motherboard is not burned out, most devices can run.

It's normal to plug in a bad motherboard and burn it out.

Nowadays, most motherboards use BIOS, and there will be a "drop" sound when they are turned on.

If there is no sound or the sound is wrong, it means that it has not passed the self-test and cannot be started.

Plug all hardware back in.

If it still doesn't start.

Pull out the hardware and only leave the motherboard CPU memory, boot, there is a "drop", and all three are fine.

If there is a problem, it is generally not determined which part of the damage cannot be replaced by another machine.

Specifically, you can check the situation when each hardware is damaged.

If there is a "drop", all three are fine.

Take the monitor to another machine and try it out to see if there's a problem.

If that's fine, it's the graphics card.

The integrated graphics card can be considered for a separate one.

You didn't say the specific boot situation.

I've encountered it before, press power on, the power supply is normal, but the screen is black, and the boot BIOS is not.

In this case, the CPU is broken. I removed the CPU before, and it turned out that the CPU pins were burned or something.

Is the CPU normal you are talking about, is the fan normal? The fan is powered by the motherboard, and when you press the power button, the screen does not light up, there is no movement, and the motherboard is turned on without a dripping sound.

Look inside the case as if everything is working properly.

This is the case with mine Later, I took it to test (my friend's store, and if you want to deceive me, you won't lie to me) and confirm that the CPU is burning.

The black screen cannot be turned on, which is generally due to poor contact of the memory or graphics card or memory quality or power supply problems or poor CPU contact (no sound or beep sound when booting up, more than two tones are asked next week, one is normal).

Generally to reseat the graphics card and memory card, the main thing is to clean the dust near the CPU and memory, which is easiest to do - or replace the memory or graphics card or power supply.

The capacitor on the motherboard may be bursting, see if the capacitor near your computer's CPU (the capacitor erected like a keg) is bulging, the normal should be flat, buy a few of the same model in the electronic market, and change it for a few cents.

There is a possibility that the graphics card or CPU is too hot, check the fan.

First, turn on the host, the monitor, the monitor does not have any reflection, the display is broken, two, turn on the host, the monitor, there is a missed signal on the monitor, and then there is no response, the graphics card is bad; 3. Turn on the host, after the monitor, after flashing some English, stop moving, A, there is a problem with the BIOS setting, you need to press F1 to start the operating system, B, the operating system file is damaged, reinstall the operating system; c. There is a problem with the hard disk of the computer, and there is no way to read the data at all

What are the features? For example, the alarm sound or something, if there is, please turn on the computer to check the CPU, power supply, computer memory, graphics card or something? --

Your machine is yes.

What category is the BIOS.

You figure it out first and listen carefully.

Ringing sounds. It's a short ring.

It's still short and long.

The number of rings. Only in this way can we determine what the fault is, and most of it is software (soft) and CPU

There is also the basic problem of computer hard disk (hard).

You look at the DOS settings.

and BIOS settings ---

Computer memory error, put the computer memory down, use the gold finger there with an eraser, and then change a slot to try it. --

I've had this basic problem before. But I just changed the power supply. --

You can see if you can get into dios first. If you can, you can see if there are any mistakes. Nope! You kill the poison in safe mode. If it doesn't work yet. Just do the operating system.

First of all, it may be a problem caused by poor hardware contact, so it is recommended to check it yourself.

1. Turn off the power, open the case, clean up the dust, especially the dust of the CPU fan, and check whether the CPU fan is rotating normally. Plug and unplug the hard drive data cable and power cable (this is more important).

2. Power off, open the chassis, plug and unplug the memory, wipe the gold finger part with an eraser, and plug it back in (don't reverse it).

3. Plug and unplug the graphics card, wipe the gold finger part with an eraser, and reinsert it tightly (the buckle should be buckled).

4. Unplug the power cord, cut off the motherboard button battery, wait for three minutes, and then reinstall the motherboard.

5. If the above operations cannot solve the problem, it is recommended to send it to the maintenance center.

Think of a continuous sound (drip, drip, drip......Or four consecutive rings (Didi, Didi, Didi, Didi......）

1. Loose memory modules, poor contact, and dust accumulation will cause the screen not to be displayed and the computer not to start.

Solution: Unplug the power supply, remove the memory module, remove the floating dust at the interface with an eraser, and wipe it clean with letter paper. Put the memory module in alignment, put the index finger of both hands against both ends of the card holder, press the memory module with your thumb, press down, and hear the "click" sound, it's OK.

2. Loose graphics card, poor contact, and dust accumulation will cause the screen not to be displayed and the computer not to start.

Solution: Unplug the power supply, remove the graphics card, remove the floating dust at the interface with an eraser, and wipe it clean with a letter paper. Align the graphics card, press down and fix it, and you're done. The graphics card is damaged and needs to be replaced.

3. Motherboard problems. Solution: Unplug the power supply, remove the motherboard battery, and jump the CMOS jumper to"colse"position, hold for more than five minutes, install the battery, and resume the jumper.

That's it. Or use a paper clip to turn on the positive and negative electrodes of the CMOS on the motherboard for more than five minutes, and it will be OK.

If you refer to the above three methods, you can repair the computer.

1 The computer has changed the hardware, and if the hardware itself is questioned, it will definitely not turn on. If the hardware is good, it's a driver problem, and you can install the driver using the disc that came with the hardware purchase.

2 If the computer changes the software and can't turn on, you can use the system to restore the original solution.

3 The method of system restore is to press F8 when booting up, select Enter Safe Mode, and perform System Restore in Safe Mode.

In fact, each Windows system has its own system repair function, but you forget to use it when you encounter a problem.

XP System: "Start All Programs Attachment System Tools System Restore".

Vista System: Open Control Panel, click "System & Maintenance", > "Backup & Restore Center", > top left corner, "Repair Windows with System Restore", "> point", select another restore point, > "Next", > select the point in time where you made an error, the previous "Restore Point", > click "Next", > perform System Restore.

Win7 system: Right-click on the computer icon > Tap Properties > Click System Protection in the upper left corner > Click System Restore in the selection box that appears, select the "Restore Point" in front of the point in time where you made the error, and > Point Next to perform System Restore.

You can also open the control panel,Click on the system,Click on the system protection in the upper left corner of the interface that appears,Then click on the system restore in the system property selection box that appears,It is recommended to install ghost one-click restore,Usually use it for system backup,When the system goes wrong or even crashes,Then use it to restore,The entire C disk can be restored to the best state when it was backed up。

Personally, I suggest that the best way ,,, to reseat the memory module. Or snap off the motherboard BIOS battery for 10 seconds and put it on. Both of these methods have been tried and tested.

or the latter part in 36:00.

Hope it helps!

LZ recently changed the hard disk, right, if it is replaced, then there should be no system in your new hard disk, your boot choice, the first is HDD (hard disk), it is because your new hard disk does not have a system, so you can't proceed to the next step, first put the boot frist choose CD ROM, and then use the disc to install the system once, installed in your new hard disk.

This is very simple, it is not checked to the hard disk, you can enter the BIOS design Ha.

If this happens on your computer, you can try the following methods to solve it:

1. The motherboard does not turn on when powered on - generally due to insufficient power supply and switch circuit problems. If possible, use the meter to measure.

2. There is no signal from the fan to the display screen, and there is no alarm from the host, which is mostly a memory problem, followed by the graphics card, and there are very few problems with the graphics card. If there is a problem with the graphics card, the alarm will be called.

3. The quality of the connection between the accessories,—— poor contact between the power cord and the socket, the incorrect plugging between the memory, the display and the state transport card and the motherboard, loose, and poor contact. There is a connection between the graphics card and the monitor, the power socket is broken, and the data cable of the hard disk and optical drive is burned.

If you change it to a motherboard or graphics card, you must reinstall the system.

Because the old system in the hard disk, the drivers of the rough socks motherboard and graphics card are all the motherboards or graphics card drivers of the past, which will conflict with the new rocky motherboard or graphics card, causing the system to fail to boot and work.