The desktop power supply is problematic, and the desktop power supply does not start for maintenance

The memory and graphics card may be loose.

If the desktop does not start without power, it is possible that the power supply is broken, replace the power supply. It is also possible that the boot button is broken, and the 2 pins on the motherboard are shorted with a screwdriver, and there may be a problem with the motherboard itself. Replace the motherboard. Let's take our time.

It may be caused by poor contact between the memory slot on the motherboard and the memory, so you need to dial the memory in the memory, and then wipe it with an eraser to the place where the gold finger is pointed or blow, the main purpose is to do a dust cleaning. Or do a replacement problem and it will be solved.

The reasons why a computer won't boot are complex and can be summarized into two categories: hardware reasons and system reasons. Under normal circumstances, if you can't pass the self-test, it's the hardware; It is the system that can pass the self-test.

Buy one directly, it's a waste of time to repair it, or it's good to buy a second-hand one, which doesn't affect the use.

It's really troublesome to explain your question, so let's talk about it one by one.

1.The rated power of the power supply refers to the maximum power that the power supply can continuously and stably output, in addition to the rated power, the power supply also has a peak power (also called the maximum power), this power can only be maintained for a short time, so it is meaningless.

The power supply is not rated at all times, but is determined by the power consumption of the host accessories. For example, if your host needs 200W of power at a certain time, even if your power supply is rated at 300W, it will still only output 200W of power. It's like driving a car, you can get to 200 km/h, but you can't always go at that speed, right?

Of course, it is best not to exceed the rated power of the power supply, as exceeding it may cause problems.

2.Conversion efficiency = output power input power. When the power supply is working, it will generate heat, and some of the power will inevitably be wasted, which means that the input power of the power supply must be greater than the output power.

The output power is to power the main unit, and the input power is input from the wire to the power supply. Obviously, the higher the conversion efficiency, the more power is saved, which is saving money for you, so the level of conversion efficiency is very meaningful to users. However, the conversion efficiency does not affect the rated power, the power supply is rated at 300W, even if the conversion efficiency is low, it can output 300W of power, but the waste of power is different.

3.Power factor = active power apparent power. Active power is the power that is really consumed, and the apparent power also includes a part of the reactive power, note that this part of the power is not consumed, but stored (if you are interested, you can learn about it, it is more complicated and I won't say much here).

In China, due to the common use of active energy meters, those reactive power can not be detected, so no matter how low the power factor of the power supply is, it will not waste a penny more (it is not the same in Europe and the United States). In addition, the power factor has nothing to do with the power rating of the power supply.

To sum up, the rated power of the power supply is basically a fixed value, and the conversion efficiency and power factor have no effect on it. The output power of a power supply at a given moment is determined by the power consumption of a computer accessory.

The actual output power of the power supply The power consumed by the machine parts (as long as the power consumed by the machine parts is lower than the rated power of the power supply, the power supply can operate safely).

The power supply is as much as the machine needs, and it does not mean that a 300W power supply consumes 300W at any time).

Conversion efficiency of the power supply = output power of the power supply Input active power of the power supply Power factor of the input side of the power supply = input active power of the power supply Input apparent power of the power supply Rated power of the power supply = The power of the maximum continuous output of the power supply (not the power that can be reached at the maximum instant, the so-called maximum power.) Not to mention the input power of the power supply).

In summary, the power consumption (the amount of words in the meter) = the actual output power of the power supply The conversion efficiency of the power supply is really tiring to type, I hope it can help you!

The rated power is the power that the power supply can output stably over a long period of time.

The actual output of the power supply depends on how much your accessories actually use.

For example, a faucet with a diameter of 2 cm and a faucet with a diameter of 5 cm will have the same total amount of water when filled with the same bucket.

Rated power refers to the power of the appliance when it is working normally. Its value is the rated voltage of the appliance multiplied by the rated current. If the actual power of the appliance is greater than the rated power, the appliance may be damaged; If the actual power is less than the rated power, the appliance may not be able to operate.

There are a lot of questions, I hope you can answer patiently, thank you, is the higher the power rating of the desktop computer, the better? 2. The amount of power consumption is not directly related to the rated power of the power supply, and the rated power of the power supply is only the ability of the power supply.

500W power supply does not mean that the output is 500W, it depends on the load.

Equipped with a larger power supply will save more power, because the power supply has a low energy efficiency coefficient under full load and no load, and the energy efficiency coefficient is the highest at about 70% load, but the gap is not very large.

Computers that require a rating of 400W generally work at around 200W most of the time, and the power will only reach full load when running large 3D games.

As long as the power supply meets the maximum power demand of the computer, the purity of the output current of the power supply (small clutter, small pulse) plays a decisive role in the stability, that is, the workmanship quality of the power supply is very important.

Therefore, a large power supply has little impact on stability (brand workmanship) and has little impact on power consumption (computer load).

500w is very good and far-sighted, you have reserved power for the future replacement of hardware, not bad! Power consumption depends on the power consumption level of your computer equipment such as motherboard, CPU, graphics card, etc., mainly CPU, and graphics card, and power supply has nothing to do with it, you just make a 1000W platform with Atom will be standby more than a dozen watts, full load dozens of watts.

The power factor of the switching power supply, according to the actual power supply power of your computer, divide it by the power factor, and then multiply it to choose the right one. When buying, pay attention to the heat dissipation workmanship of the power supply and the machine current that is, the power of the CPU.

Choose patiently for yourself and have a happy work life.