The computer host fan flashed and flashed, 13 seconds and 4 seconds, and then the display screen cou

2. After powering on, press the caps lock key of the keyboard, if the case lock indicator does not change, it is generally caused by the failure of the host to start. It is necessary to further check the motherboard, memory, hard disk and other hardware, and use the replacement method to determine the faulty hardware, and replace it.

3. If the case lock indicator changes after pressing the caps lock key on the keyboard, it is generally a fault of the graphics card.

4. If there is no problem with the above, the system will turn black after booting, which is generally a system failure, use the system disk to boot, and the system can be restored to normal under new installation.

There are two conditions that can cause this phenomenon.

1. If the hardware has the problem of poor contact, all hardware can be replugged and unplugged.

2. There is a short circuit in the motherboard, which needs to be checked with a multimeter to determine the relevant devices, and this more complicated situation can only be dealt with by special maintenance.

What you can do is the first one, guaranteeing that there are no hardware connection issues.

If you have a diagnostic card, you can roughly judge the problem, and from the current phenomenon, the possibility of a motherboard problem is relatively high.

In this case, considering that the computer host fails to start normally, such as poor contact, or hardware failure, etc., it is necessary to use the replacement method to determine the cause of the failure.

Even if there is a virus on your computer's hard drive, it is not possible for the virus to run before the computer is turned on.

In this case, you need to unplug the power cord first, buckle the button battery on the motherboard and wait for a minute, and then install it back and then power it on.

The computer monitor flashes and goes out, the problem may be a display problem, or it may be a host problem, the specific judgment is as follows:

1: First judge whether the display is normal, remove the signal connection cable of the display from the host, and supply power to the display, under normal circumstances, there will be a picture on the display screen (no signal input or no input signal detected), if you can display a normal prompt. Then the display is normal, if there is no display or yes, the indicator light of the display has been flashing and flashing, and the display is faulty.

2: The monitor is normal, and the computer start-up display flashes and disappears, it may be "the host is not working, or there is a problem with the graphics card".

It should be a problem with the display The display light flashes and flashes That kind of situation is when the host is not turned on, but the reality device is turned on But if it can't be turned off, that's the problem of your monitor If it's a problem with the host, the power indicator of the display won't turn off Thank you for adopting.

There are 3 possibilities, 1 has no signal, 2 the monitor is broken, and 3 the graphics card is broken.

Prove that the monitor does not receive the signal from the graphics card, can the host computer work normally?

First of all, see if the display can be turned on normally, if you can, disassemble the main chassis, unplug the memory module, wipe off the gold finger, and then install it.

Plug in a motherboard diagnostic card to see where the problem is. There are just too many black screen issues. It's hard to say.

Generally, the pieces inside are loose. Take off the memory, graphics card, and wipe the gold finger on the installation. After taking the power cord off, buckle the battery from the motherboard.

Give the motherboard a discharge and take a look. It can generally be solved.

If you don't understand it yourself, take it to the computer store.

1. All of this situation is generally caused by the oxidation of the gold finger in the memory or poor contact. Encounter this situation:

1. Unplug the computer power cord first, and press the on/off button on the chassis 5-6 times. Releases the residual charge of the motherboard.

2. Then open the side panel of the chassis and plug and replace the slots of the memory.

3. Remove the CMOS battery from the motherboard and install it after 1 minute.

The computer has a discrete graphics card, so it's best to plug and unplug the graphics card. After the above operations are completed, the computer is powered back on.

The fault still needs to be booted using the minimum system method: (power supply + motherboard + CPU + memory + graphics card + monitor).

At this time, you should normally see the display content, pop up the hard disk can not be detected, keyboard and other prompts, you can enter the BIOS, and the buzzer has no abnormal sound. If it is abnormal, the monitor does not display (or the screen is blurred) or the buzzer has an abnormal sound.

1) Memory issues.

a.Problems per se. It doesn't work in any slot, and it doesn't work on other machines. Then the only way to do this is to change the memory. Buzzers generally have an unusual sound.

b.Compatibility issues. Other machines can be used, but this one can't; Or a single root can be used separately, but two roots cannot be used. Change memory.

2) Display graphics card issues.

a.Wiring issues. Check if there is any needle breakage or short circuit.

b.The graphics card itself is damaged.

c.The monitor is damaged (very unlikely).

b.Motherboard issues. The graphics card slot part, or the related control circuit is faulty. At this time, it can only be solved by changing the motherboard.

It's not that troublesome, it's caused by the insufficient power capacity of your computer or the insufficient output power caused by the aging of the power supply electronic components after the computer has been used for a long time. Before the blue screen, you may have run a large file, causing the computer CPU or graphics card to consume too much power and suddenly blue screen. The solution: Please take a break and unplug your computer for the time being.

After about a few minutes, plug it back in and turn it on. If it still doesn't turn on or happens frequently after turning it on, it's time to consider replacing the power supply.

There are many reasons for the failure of the computer to turn on the black screen, such as the display is damaged, the motherboard is damaged, the graphics card is damaged, the graphics card is in poor contact, the power supply is damaged, the CPU is damaged, etc. For the treatment of the black screen of the computer, the method of eliminating and replacing is basically adopted, and the principle should be based on replacing and eliminating the most suspicious parts first.

1.Unplug the data cable connected to the monitor and the console, and turn on the power switch of the monitor separately. Generally, if the display is normal, it will display the manufacturer's information of the display or a prompt that the monitor is not connected, if it can be displayed normally, it indicates that the display is unlikely to be damaged.

2.Check that the exposure is good. Check whether the contact between the graphics card and the monitor is good, and whether the contact between the graphics card and the motherboard IO slot is good, and if necessary, remove it and reinstall it again to ensure that it is installed in place and in good contact.

3.If there is no problem with the monitor, check whether the CPU fan is running, if it is running, use a multimeter to measure whether the voltage output is normal to 12V, 15V, if not, you can change the power supply to give it a try.

4.If the black screen still appears, take out the components installed in the computer, leaving only the CPU, graphics card, and memory sticks, and the cause of the fault can be limited to the CPU, motherboard, and memory. Generally, if there is a fault in the memory, there should be an alarm sound.

If the memory fault is ruled out, only the CPU and the motherboard are left.

How many watts of power is there? It may be that the power supply is insufficient, whether you have changed things yourself.

What did you do before the problem went wrong?

There may be a problem with your computer's power supply.