My computer s boot screen doesn t light up, the keyboard light doesn t light up, and the alarm keeps

If the memory slot is gray or the gold finger of the memory is dirty, take the eraser and wipe it down, blow the slot a few times and scrape it with a knife.

It's OK

The light does not light up, there are 3 reasons, 1 does not power on, 2 the graphics card does not scan and does not sound 1 long and 2 short, 3 The memory is not in good contact and keeps ringing.

Reinserting the memory generally solves the problem.

No, the only way to do this is to change the memory.

Alarm Sound Alarm Sound Meaning.

1 Short The system starts normally, indicating that there is nothing wrong with the machine.

2 Short There is a problem with the general settings, please go to CMOS Setup and reset the incorrect options.

1 Long 1 Short RAM or motherboard error. Try to change the memory, if it still doesn't work, you have to change the motherboard.

1 long 2 short monitor or graphics card error, detect graphics card and display.

1 long 3 short keyboard controller error. Check the motherboard and contact the merchant.

1 long 9 short Motherboard flash RAM or EPROM error, BIOS corruption. Contact the merchant and try a different flash ram.

Constantly ringing (long sound) memory or vga has a problem with one of them. The memory module is not plugged in tightly or damaged.

Constant alarm The power supply and display are not properly connected to the graphics card. Check all the plugs.

Repeating short rings Power issues.

No sound, no display, power issue.

Alarm Sound Alarm Sound Meaning.

1. Short: The system starts up normally.

1 Short 1 Short 1 Short System power-up initialization failed.

1 short, 1 short, 2 short, motherboard error.

1 short, 1 short, 3 short, CMOS or battery failure.

1 Short 1 Short 4 Short ROM BIOS verification error.

1 Short 2 Short 1 Short System clock error.

1 Short 2 Short 2 Short DMA initialization failed.

1 Short 2 Short 3 Short DMA page register error.

1 Short 3 Short 1 Short RAM refresh error.

1 Short 3 Short 2 Short Basic memory error.

1 Short 3 Short 3 Short Basic memory error.

1 Short 4 Short 1 Short Basic memory address line error.

1 short, 4 short, 2 short, basic memory verification error.

1 Short 4 Short 3 Short EISA sequencer error.

1 Short 4 Short 4 Short EISA NMI port error.

2 Short 1 Short 1 Short First 64k basic memory error.

3 Short 1 Short 1 Short DMA register error.

3 Short 1 Short 2 Short Main DMA register error.

3 Short 1 Short 3 Short The main interrupt handles register errors.

3 Short 1 Short 4 Short Handle register errors from interrupts.

3 Short 2 Short 4 Short Keyboard controller error.

3 Short 1 Short 3 Short The main interrupt handles register errors.

3 Short 4 Short 2 Short Error is displayed.

3 Short 4 Short 3 Short Clock error.

4 Short 2 Short 2 Short Shutdown error.

4 Short 2 Short 3 Short A20 Door Error.

4 Short 2 Short 4 Short Protected Mode Interrupt Error.

4 Short 3 Short 1 Short Memory error.

4 Short 3 Short 3 Short Clock 2 Error.

4 Short 3 Short 4 Short Clock error.

4 short 4 short 1 short serial port error.

4 short, 4 short, 2 short, parallel port error.

4 Short 4 Short 3 Short Digital coprocessor error.

Solution: Press the numlock key of the keyboard to see if the numlock light can be controlled, which means that the computer is normal and the monitor is problematic.

Check the display, whether there is no signal or the power light is not on, if there is no signal, check the ** cable connected to the computer, or plug it back in, the power light is not on to check the power cord, if it is useless to replug the power cable, the monitor is sent for repair.

The numlock mentioned earlier, if you can't control it, it means that the host is not attacking the usual, disassemble and reinsert the memory graphics card (pay attention to wash your hands first to release static electricity), if it still doesn't work, it is recommended that you find a professional to check.

Troubleshooting method for no display failure when the computer is turned on:

First of all, check whether the external wiring of the computer is connected, and plug each cable back in to see if the fault is eliminated.

If the fault persists, then open the main chassis to check whether there is any excess metal in the chassis, or the short cleaning path caused by the deformation of the motherboard, and smell whether there is a burning paste in the chassis and whether there are burned chips on the motherboard.

If it keeps ringing one after another, it means that the memory module is loose. Now this weather can easily lead to such a situation.

The solution is simple, open the case, and there is a bar next to the CPU fan stuck in one of the slots in a set of slots, and this is the memory module. Press the clips on both sides to eject the memory module, and then use a hard eraser to wipe off the oxide layer on the top row of copper sheets (the raw material is alloy metal), and rub it a few more times until there is not too much black wiped off. If you don't have an eraser, you can use an exercise book or book paper to erase it, but be careful not to rub the small particles on the side.

Rub it a few more times until no visible black patches appear on the paper.

Then clean the slot, plug the memory module back in, and press it tightly.

This should basically solve the problem.

If you still have questions, please explain how it rings. One long and three short, one long and one short. Or keep a short ring, etc.。。

Unplug the memory and discrete graphics card, wipe the front and back of the gold finger with an eraser, and insert it again; motherboard discharge; Clean the CPU radiator, recoat the silicone and install it again, try these the same thing, and it should be no problem.

Take it to fix it, this problem is big, you can't get it yourself, the drip sound is long and short, the length is different, the problem is different, your phenomenon is estimated that the motherboard self-test has not been done, so there is no response Go fix it, if you don't understand, don't get it, the more you get it, the more you get it.

If the memory is broken or loose or the contact is poor, take an eraser and plug the gold finger of the memory back in to know that it will not work, if it still doesn't work, change the memory.

There's something wrong with the memory, you unplug the memory, use the eraser to wipe the gold finger, and then clean the dust inside the card slot.

There is an error in the system partition disk, solution: reinstall the system!!

If there is a problem with the interface connected to the host, you can check it!

Under normal circumstances, the maximum failure to boot the computer is a memory contact problem, remove the memory, erase it with an eraser, install it again, and start it.

Second, check if the power supply fan is running, if not, it is estimated that the power supply is faulty.

Third, even if there is a problem with the graphics card, the keyboard and mouse lights will also be on, but the big deal is that the display is not displayed, so the graphics card can basically be ruled out.

To sum up, it means that 80% of this situation is poor memory contact and 20% is a power supply problem. (Motherboards are rarely broken unless they are struck by lightning).

There are also these two common methods.

Method 1: If there is no alarm sound when the computer is turned on, there is no self-test phenomenon when the computer starts. It's really hard to tell.

But generally with the motherboard. cpu.The COMS setting error is related to the power supply.

It is recommended that you clear the coms in case of a power failure, restore the default settings of the coms, and try it.

Method 2: If the fan can start, the motherboard will be powered normally. The system won't boot, first check if the CPU is normal! You can remove the CPU and put it on other computers that can run normally, but if it can't start, the CPU is broken!

It can start, indicating that it is not the reason for the CPU. Listen to whether there is an audible alarm when it starts. It's easy to say that there is an alarm sound, and it can be distinguished according to the type of sound.

Generally this type is mainly due to CPU and motherboard. Of course, you have to go to CMOS, set the default factory settings, and check if the voltage is normal? If the voltage is abnormal, there is a problem with the power supply!

Replace it with a new power supply, preferably a power supply of more than 300W, to ensure sufficient power supply.

You take off the coms battery on the computer motherboard and use a metal (tweezers or key) object to short the positive and negative poles of the battery holder for seven or eight seconds, and then reseat the memory and graphics card (forget it if you don't have a graphics card), of course, clean up the dust by the way, especially the gold finger of the memory and graphics card. Then boot it on again. Keep in mind that the above actions must be performed without a power plug in.

This has to be opened and cleaned up, can you try it?

The motherboard has static electricity or the COMS button battery is dead, and it cannot be self-tested.

First of all, press the keyboard size smile Huiwrite conversion or numeric keypad lock button to see if the keyboard light responds, there is an explanation of the monitor and the display connection problem, no, it means that the machine is not booted normally. Follow the methods below to find them one by one.

Excluding the connection line reasons, there are the following reasons (according to the common occurrence frequency of the family land order):

1. Loose memory.

Open the side cover of the case, test the active memory on power, and listen for the alarm tone. If there is an alarm tone and a long alarm tone to reseat the memory, if it cannot be resolved after many times, it should be judged that the memory is broken.

2. The graphics card is loose.

Active graphics card and boot test, if there is a long 3 short alarm graphics card problem, 3, the memory is broken.

4. The graphics card is broken.

5. The motherboard is broken.

Discharge the coms, and then turn on to check whether the components of the motherboard are deformed and hot, if there is a broken motherboard.

6. The power supply is broken.

Try replacing the power supply.

7. The CPU is in poor contact with the base.

The CPU slots on the left and right parts of the AMD5200+ motherboard are not in close contact with the CPU, and spacers need to be added on both sides.

Other problems need to be analyzed specifically, and it is best to judge if there is a diagnostic card.

Also check whether the CPU fan and graphics card fan contact is normal.

Everything is normal when the computer is turned on, there is no alarm sound, but the keyboard light does not light up no matter how you press it, and the solution is as follows:

One: First of all, look at the indicators in the commonly used mouse and keyboard to see if they are on.

2: If the indicator light in the mouse and keyboard is not lit, then it can be preliminarily concluded that it is a problem with the computer motherboard and memory, here as long as the computer is shut down first, and then disconnect the power cord of the host, and then the button at the computer switch, press it several times repeatedly, here you have to press it several times, the purpose is to release static electricity.

Memory cards generally don't break so easily. Normally, it's dirty, just pull it out and clean it up.

The memory is not in good contact, and it is fine to wipe it clean with an eraser.

Try to change the memory, 80% of the memory is broken.

Check whether the cable between the main chassis and the monitor is normal, and turn on the monitor switch separately to see if the brand icon is displayed.

Generally, the memory is in poor contact, remove it and clean the gold finger with a rubber brush.

The host power supply is faulty, or the motherboard power is plugged in, or the case power button is faulty.

The CPU fan doesn't turn, and the CPU memory and power supply are not considered for the picture.

Unplug the memory card and wipe it.

Wipe the memory and plug it back in, or change the slot.

This phenomenon is divided into two situations to eliminate: one is hardware damage failure, and the other is hardware contact failure.

First, troubleshoot the contact fault, open the case cover, and check if the CPU fan is working properly. If it works normally, remove the CPU, memory module, and graphics card separately, clean them up, and install them in the normal direction. Turn on the computer to see if the fault has been eliminated.

If the contact fault cannot be ruled out, it should be hardware damage. This can only be determined by the method of elimination. Remove the memory module and graphics card first, and turn on the computer to see if the fault prompt is the same.

If yes, after shutting down, install the graphics card, and then turn it on to see if the fault is the same. Finally, put the memory module on the mark, and determine which hardware has the problem according to the change of the prompt sound in these cases.

The best way to troubleshoot hardware failures is to replace them, and if there are accessories, replace them with relevant accessories to quickly determine the fault.

Tell me in detail how to sound the alarm, such as a long sound. One long and one short.

Reinstall the system! Simple and straightforward.