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PC Won't Turn on But USB Ports and motherboard lights up

FAZ98
By FAZ98
in Troubleshooting
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Hi, everyone

I'm having a problem I cannot seem to figure out. Today, my desktop PC would not turn on. When I pressed the power button, nothing at all happened (no lights, no fans, nothing). I noticed, though, that my USB mouse and keyboard were still getting power and were lit up.

I turned everything off, unplugged the system, removed the system from the surge protector, and removed the surge protector from the wall. I hooked everything up again, but it still would not turn on.

I then tried turning the PC on by pressing the power switch on the motherboard itself; but this did not work either.

I then left it alone for about 10 minutes while I did some searching on this site for an answer. Just for the heck of it, I tried the PC again and it worked. It stayed on and worked perfectly fine for about 30 minutes. After I shut the PC down, I tried to turn it on again, but it wouldn't work. I've been trying to get it to come on for about 20 minutes now and cannot get it to boot up again.

So that's where I am now. Stuck.

Specs :

Ryzen 5 3600

ASUS ROG B450F Gaming

Hyperx DDR4 3200 MHZ 

Everything was built about three months ago and has been working perfectly until today.

I would really appreciate any help I can get with this. Thanks!

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Posted

Try with another power supply.

Keyboard and mouse and some usb ports and the chipset on the motherboard are powered from 5v stand-by on your power supply which is basically a totally separate power supply inside your power supply, like a usb phone charger. This small 5v power supply runs 24/7, separate from the big power supply.

 

When the motherboard sends a command to the psu to turn on, the psu turns on the "big" power supply part which gives 3.3v , 5v and 12v to the computer.

 

So either the psu is faulty and never tells the motherboard "i'm ready to start the big power supply" so the motherboard waits for psu to get ready, or the motherboard has some problem and the command to start never goes to the psu,,, this later thing can happen if the bios is corrupt or something like that.

 

If you have a multimeter around you can check if the psu is working by sending that command to turn on the psu yourself.

Disconnect all cables from computer, and then connect the PS_ON pin to any ground (COM) pin in the 24 pin atx connector. This tells the psu to turn on all the outputs, so you will get 3.3v , 5v and 12v on the wires.

If the psu doesn't turn on completely then, the psu is faulty.

 

Why is -12V needed on an ATX power supply - Super User

 

 

 

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Posted

Try to reseat the RAM and GPU.

Please quote or tag me @Void Master,so i can see your reply.

 

Everyone was a noob at the beginning, don't be discouraged by toxic trolls even if u lose 15 times in a row. Keep training and pushing yourself further and further, so u can show those sorry lots how it's done !

Be a supportive player, and make sure to reflect a good image of the game community you are a part of. 

Don't kick a player unless they willingly want to ruin your experience.

We are the gamer community, we should take care of each other !

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4 minutes ago, Void Master said:

Try to reseat the RAM and GPU.

Even If I try to post without the RAM AND GPU It wont start

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7 minutes ago, mariushm said:

Try with another power supply.

Keyboard and mouse and some usb ports and the chipset on the motherboard are powered from 5v stand-by on your power supply which is basically a totally separate power supply inside your power supply, like a usb phone charger. This small 5v power supply runs 24/7, separate from the big power supply.

 

When the motherboard sends a command to the psu to turn on, the psu turns on the "big" power supply part which gives 3.3v , 5v and 12v to the computer.

 

So either the psu is faulty and never tells the motherboard "i'm ready to start the big power supply" so the motherboard waits for psu to get ready, or the motherboard has some problem and the command to start never goes to the psu,,, this later thing can happen if the bios is corrupt or something like that.

 

If you have a multimeter around you can check if the psu is working by sending that command to turn on the psu yourself.

Disconnect all cables from computer, and then connect the PS_ON pin to any ground (COM) pin in the 24 pin atx connector. This tells the psu to turn on all the outputs, so you will get 3.3v , 5v and 12v on the wires.

If the psu doesn't turn on completely then, the psu is faulty.

 

Why is -12V needed on an ATX power supply - Super User

 

 

 

I am sorry but I do not have a multimeter to check it but when the PC turns on whenever it feels like. It works like nothing happened to it. Can there be some other reason?

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13 minutes ago, FAZ98 said:

Even If I try to post without the RAM AND GPU It wont start

The PC won't post without the RAM and GPU, it needs them......

Reseat them and report back.

Please quote or tag me @Void Master,so i can see your reply.

 

Everyone was a noob at the beginning, don't be discouraged by toxic trolls even if u lose 15 times in a row. Keep training and pushing yourself further and further, so u can show those sorry lots how it's done !

Be a supportive player, and make sure to reflect a good image of the game community you are a part of. 

Don't kick a player unless they willingly want to ruin your experience.

We are the gamer community, we should take care of each other !

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On 7/5/2020 at 3:34 AM, Void Master said:

The PC won't post without the RAM and GPU, it needs them......

Reseat them and report back.

I mean not even the processor starts to work or anything. Nothing Happens. 

 

I tried doing it it didnt work

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  • 7 months later...
Posted
On 7/4/2020 at 3:55 PM, FAZ98 said:

Hi, everyone

I'm having a problem I cannot seem to figure out. Today, my desktop PC would not turn on. When I pressed the power button, nothing at all happened (no lights, no fans, nothing). I noticed, though, that my USB mouse and keyboard were still getting power and were lit up.

I turned everything off, unplugged the system, removed the system from the surge protector, and removed the surge protector from the wall. I hooked everything up again, but it still would not turn on.

I then tried turning the PC on by pressing the power switch on the motherboard itself; but this did not work either.

I then left it alone for about 10 minutes while I did some searching on this site for an answer. Just for the heck of it, I tried the PC again and it worked. It stayed on and worked perfectly fine for about 30 minutes. After I shut the PC down, I tried to turn it on again, but it wouldn't work. I've been trying to get it to come on for about 20 minutes now and cannot get it to boot up again.

So that's where I am now. Stuck.

Specs :

Ryzen 5 3600

ASUS ROG B450F Gaming

Hyperx DDR4 3200 MHZ 

Everything was built about three months ago and has been working perfectly until today.

I would really appreciate any help I can get with this. Thanks!

 

I am facing exactly the same problem. Did you solve your problem? If so, please can you give me some light?

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  • 3 months later...
Posted

I faced this issue a few months ago. Tried a bunch of things, and out of nowhere it worked again. A few months later, it happened again, after trying a bunch of things again, i left the mobo with the cpu and 1 ram stick charging a a few usb devices, went to lunch and when I came back the computer was on. Today it happened again, this time I didn't even took it apart, just plugged a lot of USB devices and waited a couple hours, and it was on again. 

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  • 4 weeks later...
Posted

Hi,i have this same issue. I had this built and then sold it and kept them back in the boxes perfectly how it  came in box. I built it yesterday again and there's no post or anything, I've tried the jump start on my psu and it worked but i tried on the mobo and it didn't do anything. I've reseated the cpu and ram alot of times but no luck. The rgb on mobo and peripherals comes on but no post.  Please help

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