What should I do if the computer does not display when it is turned on?

Solutions to the problem that the computer does not display when it is turned on: 1. Check whether the computer's power cord is connected properly; 2. Check whether there are any excess metal objects in the main case or observe whether the motherboard is in contact with the case; 3. Repair the power supply Switch wire; 4. Replace the power supply.

The operating environment of this article: Windows 7 system, Dell G3 computer.

How to troubleshoot the problem of no display when the computer is turned on. (No alarm sound)

Step 1: First check whether the external wiring of the computer is connected properly, and re-plug each connection to see if the fault is eliminated.

Step 2: If the fault persists, then open the main case and check to see if there are any excess metal objects in the case or a short circuit caused by the deformation of the main board. Smell whether there is a burning smell in the case and whether there are any traces on the main board. Burnt chips, whether the capacitors around the CPU are damaged, etc.

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

Step 4: If the fault persists, unplug the Reset line and other switches and indicator light connections on the motherboard, and then use a screwdriver to short-circuit the switch to see if it can be turned on.

Step 5: If the computer cannot be turned on, then use the minimal system method to unplug the data cables of the hard disk, floppy drive, and optical drive, and then check whether the computer can be turned on. If a startup screen appears on the computer monitor, it means the problem is among these devices. Then connect more than one device to the computer one by one. When a certain device is connected, the fault reappears, indicating that the fault is caused by this device. Finally, focus on checking this device.

Step 6: If the fault persists, the fault may be caused by memory, graphics card, CPU, motherboard and other equipment. Then use the plug-in method, swap method and other methods to check whether the memory, graphics card, CPU and other devices are normal. If there is any damaged equipment, replace the damaged equipment.

Step 7: If the memory, graphics card, CPU and other devices are normal, then discharge the BIOS, use the isolation method, place the motherboard outside the chassis, and connect the memory, graphics card, CPU, etc. for testing. If the computer can is displayed, then install the motherboard into the chassis and test until the cause of the fault is found. If the fault persists, the motherboard needs to be returned to the manufacturer for repair.

Step 8: There is no display but an alarm sounds when the computer is turned on. When the computer is turned on, the system BIOS starts POST (power-on self-test). When a fatal error is detected in a device in the computer, The control speaker will sound an error report. Therefore, there may be a problem that there is no display and alarm sound when the power is turned on. For problems with no display and alarm sound when the computer is turned on, you can check the faulty device according to the meaning of the BIOS alarm sound to eliminate the fault.

Unable to boot, indicator light is off Troubleshooting

When the computer fails to boot, follow the following methods to detect:

(1) First check the computer’s power supply Are the cables connected properly? If it is normal, then open the main chassis and check whether the mainboard power cable is connected to the mainboard power interface normally.

(2) If the connection is normal, then check whether there are any excess metal objects in the main chassis or whether the motherboard is in contact with the chassis. If so, the computer may not be able to boot due to a short circuit.

(3) If there are no extra metal objects in the chassis and the motherboard is not in contact with the chassis, then unplug the motherboard power switch cable and use tweezers to short-circuit the motherboard power switch interface. If the computer can start, it may be The power switch cable on the chassis has poor contact or is damaged. Repair the power switch cable.

(4) If the motherboard power switch is short-circuited and the computer cannot start, then unplug the power cord from the motherboard and use a wire to connect the green wire hole of the power connector of the motherboard power interface to the black wire next to it. If the hole connection is short-circuited, check whether the fan of the power supply rotates. If the fan does not rotate, the power supply may be damaged and replace the power supply.

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