Please hardware expert The computer won t turn on 20

If you really want to hang up the fan, it is that the heat dissipation is not enough, and the CPU is burned.

But it doesn't usually happen

You say: "A reason has been ruled out: power, reset and other wires are plugged in correctly, I plugged them in step by step according to the manual, and checked that they are correct".

Do you check the positive and negative poles???

Is the power supply plugged in to the motherboard???

The probability of error in the motherboard manual is 75% I have been engaged in the installation for more than 1 year, and it is rare to see the correct motherboard plug-in instructions.

If you look closely at the corners of the motherboard cables, they are marked underneath the pins, and that's the right thing

Are you not lighting up inside the case, you put your motherboard and other things on a sponge to see if it can light up, if you can, it could be that the fan base of your Mars 9 is touching the chassis and causing a short circuit.

If it still doesn't light up, it must be something else, so you can try the method I said first.

Take off the power supply on the motherboard first, connect the power supply with iron wire to see if the power supply is turning, and plug it back in if it turns.

With the original fan, the two types are not adapted.

From the provided situation, the problem is that your motherboard is not booting. The CPU should be already working. There are several solutions to the problem for reference: one is to change the power supply, if your power supply is problematic or the power is insufficient, the motherboard will not light up.

The second is to turn off the power, remove the motherboard battery, stop for three or five minutes and install it. Sometimes, the CMOS will make an error and the motherboard will not light up, and removing the motherboard battery can correct this problem.

The third is to try to change the memory, sometimes the memory just wiping it can't solve the problem.

The fourth is the problem of the CPU, on the surface it seems that the CPU is working, but in fact it is not working. Changing one will solve the problem.

The fifth motherboard is scrapped, don't think about repairing, it generally doesn't take long to repair a repair. In addition to your computer is still within the three-year warranty, let the dealer help you replace it.

The motherboard is broken, it's worthless to repair, replace it, your computer is old!

Try using a different monitor.

Under normal circumstances, there will be a short "beep" sound when the boot is turned on, which is the sound of memory self-test, and then a boot screen will appear. If there is no startup screen, the computer will alarm and make a sound, and the computer will be judged to be faulty according to the length of the sound.

There is a splash screen, and if you can't enter the system, there is a problem with the system. 1 Short: The system starts normally. Congratulations, there is nothing wrong with your machine. 2 Short: General error, please go to CMOS Setup and reset the incorrect options.

1 long and 1 short: There is an error with the RAM or motherboard. Try to change the memory, if it still doesn't work, you have to change the motherboard. 1 long and 2 short: The display or graphics card is wrong. 1 long and 3 short: The keyboard controller is wrong. Check the motherboard.

1 Long 9 Short: Motherboard Flash RAM or EPROM error, BIOS corruption. Try a different block of flash ram.

Constant ringing (long sound): The memory module is not plugged in tightly or is damaged. If it still doesn't work, you can only replace a memory module. Repeated, short ring: There is a problem with the power supply. No sound and no display: There is a problem with the power supply.

AMI BIOS alarm sound.

1. Short sound: Memory refresh failed.

2 Tone Short Memory ECC Check Error, Solution: Disable ECC in BIOS 3 Tone Short System Basic Memory (First 64K) Check Failed 4 Tone Short Check Clock Error, Solution: Try to Replace Motherboard 5 Tone Short CPU Error, Solution:

Check the CPU settings for 6 tone short keyboard controller errors.

7. Short CPU Unexpected Interrupt Error.

8. Short video memory read and write failed.

9 short ROM BIOS test errors.

10 short CMOS shutdown registration read and write error.

11. Short Cache storage error.

1 long 3 short memory detection error.

1 long 8 short display error (monitor, graphics card).

1. Sound length The system starts normally.

Award BIOS alarm sound.

1. The sound is short, and the system starts normally.

2 short sound BIOS general error, solution: discharge.

1 long 1 short memory or motherboard error, solution: replace or reseat memory 1 long 2 short display error, solution: check whether the graphics card and the monitor are in bad contact 1 long 3 short keyboard controller error.

1 Long 9 Short Motherboard Flash ROM or EPROM Error, BIOS Has Been Corrupted Keeps Beeping Memory Corruption or Incorrect Installation.

Constant short beep Power failure High frequency long beep CPU overheating alarm beep non-stop The power supply and monitor are not properly connected to the graphics card.

No tweets Power or motherboard failures.

Before my computer was like this, check that the graphics card is broken, and it is good to replace it with a new one. If the screen doesn't light up, it's either a BIOS problem.,Or a graphics card problem.,Anyway, it's enough for a headache.。。。

The memory module is loose, just unplug it and plug it in again.

The chassis alarmed. Try reinstalling the system!

I've been in a similar situation many times, and it took me a long time to solve it. The first time is the problem of the hard disk cable, the phenomenon is that after pressing the power supply, the monitor starts, but it can't enter the system, and Windows can't boot. In the end, I learned that there was a problem with the signal cable connected to the hard disk and the motherboard, which led to poor contact, and it was solved after replacing the power cable.

The second time it's more complicated. The situation is similar to yours, the monitor doesn't respond after turning it on, except for the fan.

In this case, I think it should be poor contact, and the biggest suspicion is the motherboard. If you do this every time you turn on the phone, of course you have to switch it. While you haven't bought it for long, dare to change it.

Motherboards are prone to faults, especially OEM miscellaneous motherboards, which have a high repair rate. In addition, if your monitor is responsive and you can't get into the system, it's likely that there is a problem with the hard disk boot. You can use the optical drive to boot and try, if it can be turned on, it is a hard disk, or there is a problem with the connection, try to change the cable.

Don't look at how much this line is worth, but some profiteers are prone to problems with inferior threads. Even if it can be started, the speed has an effect, and this is my personal experience!