The computer can t turn on, the CPU fan turns, but when you turn it and stop it, it can t turn on, w

1. If there is a problem with the power supply or the BIOS setting of the motherboard, first put the motherboard battery down for a few 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. It is through the second method to solve the problem that the computer can't turn on, and the CPU fan turns and stops.

3.We can also check the memory module, the way to detect is to unplug the cable to test the boot status, if it can be turned on, it will not restart, then it is a memory problem, if not, it is not a memory problem.

4.System problems, most likely due to a fault in some aspect of the system, it is recommended that you reinstall the system.

If the computer can't turn on, the CPU fan keeps turning, and it can't be turned on when it stops, this should be a problem with the motherboard, and you can remove the accessories on the motherboard and reinstall it.

If your computer turns on a machine when it turns on a fan, but there is no way to turn on normally, this is actually your computer integration is too much, it is recommended that you clean up the integration in the computer parts, and then boot it is estimated that you can.

There is a phrase for 'power protection':

1- The power supply is faulty, and it is common.

2- There is a hardware failure on the motherboard that also causes 'power protection'.

Troubleshoot the power supply first.

If you have encountered a similar problem, it may be that there is a problem on your CPU side, there is too much dust, take it out and erase it with an eraser.

Causes and solutions for CPU fans not turning.

Method 1: The CPU fan is faulty. Under normal circumstances, the CPU fan is powered by the motherboard, and the power supply interface can be found by following the fan's cable.

If you find that the cable is loose, you can try to reconnect it and plug it firmly at the interface. If the CPU fan returns to normal operation, the problem has been resolved. If the CPU fan still doesn't rotate, you can try to connect the power cable to another other same power supply interface, if the fan is running, it means that the CPU fan power supply interface is damaged, but the impact is not big (just the BIOS can't detect whether the CPU fan is running).

Method 2: CPU fan dust blocking. If the desktop is used for a long time and is not cleaned, it will cause dust deposits on the CPU fan and block the fan blades.

Remove the CPU fan and use a brush to clean it, and drip an appropriate amount of lubricating oil on the fan shaft to reduce resistance.

This kind of problem in the computer needs to be detected and then eliminated: 1. Memory problem;2. Power supply problems;3. Motherboard problems. The corresponding detection solutions are as follows:

1.Memory issues.

First of all, rule out the memory problem, unplug the memory strip, wipe the gold finger with rubber, you can not find the rubber, you can also insert it back into the memory slot with clean white paper (the slot is best to use a brush to remove dust), if the fault is still a memory problem (unless the memory bar is broken).

2.Power issues.

Secondly, it is the turn of the power supply after the memory problem is ruled out. This problem can only be tested by the average user. First of all, unplug all the plugs of the power supply, turn on the power, find the tweezers (preferably tweezers, direct or slightly thicker wires will also work) let go of the 20-pin or 24-pin plug of the power supply, find the plug with plastic buttons, the third and fourth pins are green and black, insert the tweezers (or other) at both ends, if the power fan is turned, the possibility of the power supply being bad can basically be ruled out.

3. Motherboard problems.

The only remaining problem is the motherboard problem, which is the most likely. You can't check this yourself, discharge the motherboard first, vacate the CMOS, the specific operation method: the host is powered off, remove the motherboard battery, come back in about half a minute, and power on.

If this problem persists, it is recommended to send it to the repair board.

This one works with most computer models like the Dell Vostro3668.