Won t turn on the power supply and CPU fan won t turn

First of all, look at whether the light on the motherboard is on, if it is on, it means that it is not a power supply problem, if it is not on, it means that it is a power supply or electricity problem, and it proves that the electricity is not on the motherboard at all.

If the light is on, the boot is not reflected, see if the plug of the power button is not plugged into the motherboard, or directly engage in metal bumps, try If it can't be turned on, the problem is on the motherboard.

In short, the problem is in the motherboard switches and power supplies, ruling out other possibilities.

It's all said. It must be that the power supply is burning. What's wrong with the new one. Sometimes new ones don't work.

Try changing the power supply.

Check if there is a problem with the voltage input, and if there is a problem with the power supply, the new one may also break.

If the CPU stops after a few turns, it should be a problem with the motherboard.

Let's see if the plugged in place is connected.

Let's see what is burning.

I didn't even rearrange the wires.

There is no prompt sound when the boot is turned on?

It looks like it's a power issue.

Less than 200w ???

Now the P4 is using a nominal 350W.

Let's change the power supply, now it is equipped with a minimum of 300W power supply for the computer. And it has to be a good brand. Power is very important.

Second, if the computer cannot boot normally, the problem is mainly focused on the four hardware: power supply, graphics card, motherboard, and CPU.

Do a thorough cleaning of the inside of the chassis, including the power supply;

First, use a multimeter to preliminarily detect whether the power output is normal: disconnect the DC output of all power supplies, short connect the green and black wires, and use the multimeter to measure whether the output voltage of each color is normal, and the positive and negative deviation shall not exceed 5%;

Use the minimum system method to disconnect the power and data connections of other computer hardware in the host except for the power supply, graphics card, motherboard, and CPU, wipe the gold finger part of the graphics card with an eraser, remove oxides, and repeatedly plug and unplug the graphics card, and perform a power-on test every time you plug and unplug it until the BIOS self-test alarm sound appears (during which the CPU needs to be reinstalled);

When the minimal system method is invalid many times, it is necessary to consider the replacement method to eliminate the hardware one by one. If there are not enough spare parts, you can only consider sending them to a repair point for repair.

Power issues. But it's best to find a power supply and try it. Because the fan of the power supply is powered by 12V, while the graphics card is powered by 5V and some by 12V, most of the graphics cards are powered by 12V.

In this case, it is best to check for a power supply problem, and it is possible that the circuit motherboard is broken.

It could be a power supply issue.

The motherboard is broken, please see if the motherboard has a resistor bulging.

First check if there is a problem with the power supply.

This is followed by the motherboard.

Then the battery.

Both the CPU fan and the power supply fan stopped after only one turn, and it was obvious that there was a problem with the power supply.

Here's how to fix it:

1. If there is a problem with the power supply or the motherboard BIOS settings, first put the motherboard battery down after 2 minutes and then put it back to try, if the user does not know that the motherboard battery is in **, you can refer to it, and the boot test fault still exists.

2. If you suspect that there is a problem with the power supply, unplug the original power supply and plug it in again, boot the test to see if the fault has been solved.

Working principle and mode:

The graphics card is plugged into the expansion slot on the motherboard (usually the PCI-E slot, and before that there were AGP, PCI, ISA and other slots). It is mainly responsible for converting the display signal sent by the host computer to the display into a general electrical signal, so that the display can understand what the personal computer is asking it to do.

The graphics card is mainly composed of the graphics card motherboard, display chip, display memory, heat sink (heat sink, fan) and other parts. The main chip of the graphics card is called the "display chip", the main processing unit of the graphics card, and the graphics card also has memory similar to the computer memory.