The computer host light is on, but it can t be turned on, and the computer screen is black?

If the computer host light is on and the screen is black, there may be two situations:

Host issues. It is most common to see loose memory, graphics cards, or rusty pins.

Display issues. Turn on and listen carefully if the host has the sound of system starting, then the host may be fine, the problem is on the monitor, check whether the display data cable is plugged in, and whether the display is too dark.

If the computer's hard disk indicator will flash, and the display does not respond, it is a problem with the monitor or the connection line between the monitor and the computer, if the host only has the power indicator light on, and the monitor is powered on with no signal input prompt, it must be a hardware failure of the computer hostIf you still can't find the problem, then it is recommended to send the computer host for repair.

The host of the computer is already active, but if it can't be turned on, the computer will definitely cause a black screen, so it is best to turn the host of the computer back on, and then use it.

The computer host light is on, but the host computer has not been turned on, and the computer screen is black. It may be because of poor memory contact, so the screen is black. Of course, it may also be due to the fact that the monitor cable is not connected, and the discrete graphics card is not in good contact.

The computer host lights on, but the computer displays a black screen, in this case, it may be that the screen display is not on, if the screen display is on, then there is a problem with the monitor.

If the computer host light is on, but you can't turn on the black screen of the computer, you can just enter it directly from the background, or it's very convenient, you can try it.

There are two situations when the computer is turned on and the display does not respond: the display is not powered on (the power indicator is not on) or the display is powered on (the power indicator is on) but there is no signal or the screen shows "no sighal", the former indicates that the circuit is not working.

The computer host indicator light is on, but the screen is black, such a problem is generally caused by the poor contact of the memory module in the computer, you can unplug the memory module and plug it back in!

The computer case light is on, which can only prove that the case power supply has been in a normal state of power supply, and the computer needs all hardware and software systems to operate normally. For example, if there is a failure in hardware such as hard disks, motherboards, graphics cards, and memory, it will be reflected that the computer cannot start normally, and it is recommended to do a comprehensive test of the computer to determine the cause of the failure.

If the computer host has a light and can't turn it on, you should first check whether the power cord of the computer plugged into the motherboard is loose, or the graphics card is checked.

In this case, you also need to look at the keyboard light, if the keyboard light is on, it may be a problem with the monitor or cable.

If the keyboard light is not on, it means that the host is not powered on, and you need to detect the hardware problem.

Plug and unplug the memory, the most use of wipe, can generally be solved.

If the keyboard light is not on, check and re-plug the memory!

Although it is confirmed that the demand curve arises naturally from the theory of consumer choice, the derivation of the demand curve itself is not a theory that proposes consumer behavior. Simply determining how people react to change doesn't require a rigorous analytical framework. However, consumer choice theory is extremely useful.

As we will illustrate in the next section, we can use this theory to more deeply determine the factors that determine family behavior.

Instant Answer Draw budget constraint lines and indifference curves for Pepsi and pizza. Illustrate what happens to the budget constraint line and consumer optimum when pizza** rises. Use your graph to divide this change into income effects and substitution effects.

Four applications. Now that we've established the basic theory of consumer choice, we can now use it to illustrate four questions about how the economy works. However, since each problem involves family decision-making, we can address these issues with the consumer behavior model we just proposed.

Are all demand curves sloping to the bottom right?

In general, when an item** goes up, people buy less. Chapter 4 refers to this normal behavior as the law of demand. This pattern manifests itself in the demand curve sloping to the lower right.

However, as far as economic theory is concerned, the demand curve also sometimes slopes to the upper right. In other words, consumers sometimes defy the law of demand and buy more when one item rises. To illustrate how this can happen, look at Figure 21-12.

In this example, the consumer buys two items – meat and potatoes. Initially, the consumer budget constraint line was a straight line from A to B. The best advantage is c.

When the potato ** rises, the budget constraint line moves inward and is now a straight line from A to D. Now the best thing is e. It is important to note that the rise in potatoes has led consumers to buy more potatoes.

1. When the computer runs a large game or software, it is normal to freeze, wait patiently for the computer to recover or open the task manager to close the game or software.

2. The computer will automatically cut off the power supply due to overheating. At this time, it is necessary to pay attention to the heat dissipation of the computer. Try to use the computer in low temperature conditions, and if it is a laptop, you need to install an exhaust fan. If the computer has not been dusted for a long time, you can take it to the computer store for a cleanup.

3. The computer is infected with a virus. If it doesn't work, it is recommended to go to a computer store or reinstall the system yourself.

4. The plug connected to the display screen is loose, just check the plug.

5. Static electricity causes a black screen, only need to shut down the computer for a period of time.

Enter the power-saving state or show no signal (if there is an integrated graphics card on the console.)

and discrete graphics card, try inserting a discrete graphics card).

2. You can try to replace the normal display first, if it is the same, you can eliminate the problem of the display.

3. Press the Num Lock key on the keyboard, if the Num Lock light does not change, it is generally caused by the failure of the host to start, please replace the memory, power switch, CPU, graphics card and other hardware to find out the faulty hardware.

4. If you press the num lock key on the keyboard and the num lock light changes, it means that there is a problem with the graphics card.

The keyboard light is not lit, and the host light can only prove that the case is turned on normally, even if the power supply is broken, it may be powered on normally, and the motherboard, memory, CPU, power supply, and graphics card in the host will not turn on if any of them have problems.

Press "F8" when booting, press Enter, Enter, enter "Safe Mode", find: "Advanced Boot Options", and then find: "Last Correct Configuration", press down, try!

Or, find the "Normal Boot" mode in "Safe Mode", press it, and try it! If it still doesn't work next time you turn it on, I suggest you do: "One-click restore"!

That is to say, there is a problem with the computer's system, and it is best to contact the computer's after-sales customer service or send it to a professional computer maintenance department to repair the computer to restore the computer.

If the computer screen is black and the host is on, check whether the display cable is connected. If there is no problem with the cable, you need to consider the problem of memory modules.

If there is a problem with the motherboard, go to the computer store and let the professionals check whether there is a problem with the computer motherboard.

There is a problem with the host hardware. Open the case cover. How do I troubleshoot hardware issues? Minimize the system first and see if the self-test can be successful.

The computer screen is black, but the host is still on, and the light on the computer keyboard can't be turned on.

1. Check whether the external wiring of the computer is connected, and plug in the wires of each car again to see if the fault is eliminated;

2. If the fault persists, then open the main chassis to check whether there is any excess metal in the chassis, or a short circuit caused by the deformation of the motherboard, smell whether there is any burnt manuscript bridge paste in the chassis, whether there are chips on the motherboard that are burned, and whether the capacitors around the CPU are damaged.

3. If not, clean up the dust on the motherboard, and then check whether the computer is normal;

4. If the fault persists, unplug the reset cable on the motherboard and replace it with a new cable to see if this situation still exists;

5. You can go to a special place to repair the computer and find a professional maintenance personnel to repair it.