Actually, the main process of this problem is usually only after pressing the power button the fans giran for a few seconds, and indeed if there is LED lighting this also lights up for a moment, but shortly after everything turns off and the PC it won’t start and no matter how many times you try the same always happens. Other times the lights and fans will stay on, but the screen will show no image and there is nothing you can do. If this is your case, don’t despair, because we’ll tell you what you can do about it.
Why does my PC not start even though the fans are running?
We need to differentiate two of the symptoms in order to identify the problem. If by pressing the power button the fans turn and the lights come on and stay on but the PC does not start, then there is a good chance that the problem is related to the RAM memory, to the processor. , graphics card or motherboard, in that order.
However, if after pressing the power button the fans start to spin and the lights start to glow but after a short while everything turns off on its own, then the problem is more likely to have to do with the power supply, the motherboard or simply because there is a short circuit somewhere inside your PC.
In either case, we recommend that you be patient as the problem can have a very simple solution, or it can be quite difficult to find the exact problem, and it can even lead you to discern that a component is faulty and that you are going to have to buy a new one to repair the PC. Next, we’ll tell you what to do.
If the fans are running but turn off soon after
This is the most frequently recurring symptom, and it is usually preceded by a power failure or a short in the case, usually due to the case being bumped or moved or the equipment has been mishandled (for example, when cleaning the interior or installing new hardware).
The most direct way to solve this problem is, directly, to completely disassemble the PC and leave it “in the air”. It is advisable to use a multimeter or tester to verify that the power supply is providing voltages in the proper ranges before anything else. you immediately exclude that the problem is that the source has been damaged and you need to change it.
If you check the power supply and determine that it is working fine, there is a good chance that a short has occurred and as we said the easiest (albeit laborious) way to fix the problem is to completely disassemble the internal hardware of the PC and “On the air”, that is to say mount the essential components (that is to say everything except the box) on a box and see if this is how the equipment starts up. If it starts, there has been a short circuit, so take the opportunity to clean the case and the rest of the components and reassemble everything while making sure that there are no loose cables and that it There is nothing metallic touching the PC case’s platinum.
If after that the computer still does not start, then either the power supply has been damaged or the problem is, potentially, in the power supply, so if you have a chance, try a different one. Otherwise, skip to the next section because you might have had even more bad luck.
If the fans and lights remain on
When the fans and lights stay on but the PC does not start, the first thing to check is the RAM; With the PC switched off and unplugged from the mains, remove the memory modules, clean them well as well as the sockets, reinstall them and try again. Strangely enough, sometimes the problem is solved just with that.
It is also possible that the computer is simply not receiving a video signal, so the next thing to check should be the video connections from the PC to the monitor to see that everything is properly connected (try changing the cable), that the monitor is on and the input is in the correct option. Also check if the graphics card is powered on and if the PCIe power connectors are properly connected.
Also try disconnecting the graphics (obviously with the PC turned off), clean the motherboard PCI-Express socket and the graphics themselves and reconnect them. If none of this works, try connecting the video cable from the monitor to the video output of the motherboard, because sometimes if the dedicated graphics fails, the PC will automatically switch to using the built-in one.
Finally, it is possible that the worst has happened and that either the processor or the motherboard has crashed; On modern motherboards if the processor had failed you would see an image on the screen indicating it, but on older motherboards it does not and simply the symptom is that the PC does not start. not and that’s it. Either way, pay close attention to the beeps the system makes when you press the power button and check your motherboard manual to find out what is going on.
Now if the problem is that the motherboard is dead, unfortunately there is not much you can do except change it to a new one.