Question Help! No DP signal from your device, changed psu and the issue persists.

[QueendomLight]

My monitor keeps displaying no dp signal from your device, even after I changed the PSU.

I have an rtx 3060ti and a master cooler v3 elite 600w, I started noticing static electricity some time ago whenever I touched the PC and some USB ports kept working then stopping, and so on continuesly. The first time the no dp signal message showed up I unplugged and plugged some ram sticks and it worked, now it doesn't work at all. I changed the PSU to EVGA 700GD 700w 80+ gold and the issue still there.

I tried changing the GPU, and used an rx460 instead (less demanding GPU) and at first it worked, and the message disappeard, so I thought the issue is probably with the PSU and changed the PSU to EVGA 700GD, then tried hooking up the 3060ti again but the message appeared again, so I thought the issue could be with the GPU then, but when I tried hooking the rx460 again (to both the new and the old psu) this time it didn't work!!!

The dpi message showed up again even though it was working before!
I thought maybe the rx was broken somehow and used it in another old PC and it worked!
So it's not broken!

I also noticed the cpu fans keeps turning on and off while the monitor is showing the no dp message.
(This happens whenever the rtx 3060ti is hooked up, with both master cooler elite v3 and EVGA 700GD psu, BUT NOT with the rx hooked up, the dpi message is still there but the cpu fans doest turn on and off!)

I tried resetting the BIOS and CMOS but it's still not working.

And just to put everything out there in case it might help, I remember trying to update the BIOS with gigabyte windows @bios app but it didn't work, it resetted my PC but nothing happened and it didn't update, and the PC kept working normally afterwards for a while until the dp message started showing

Also I noticed that the motherboard (gigabyte b450m ds3h) have an orange light that flickers when I long press the power button to turn off the PC (which doesn't turn off) and stays still when I don't long press the power button.

And that the ram sticks light up when I plug the PSU cable into the PC, even when I still haven't turned on the power button!
And it keeps lighting until I press the power button, otherwise it won't stop.


Could a failed BIOS cause this?
And if so, why did the display work with the rx460 before and now it doesn't want to?
I'm truly lost at what the issue is.
Your help would be hugely appreciated 🙏


These are my full PC specs:

Case: Gigabyte c200 glass
CPU: AMD Ryzen 7 3700x
GPU: MSI Gaming X RTX 3060ti
Motherboard: Gigabyte b450m ds3h
Ram: Crucial Ballistix 32gb (4x8) ddr4-3200
HD: Western digital 2tb
SDs: Western digital 480gb ssd + Crucial p3 nvme m.2 1tb

Power supplies I used:
Cooler master elite v3 600w (white)
EVGA 700GD 700w (80+ gold)

I also have some rgb light fans hooked up.

 

[Ralston18]

Regarding:

"I started noticing static electricity some time ago whenever I touched the PC..."

That does not sound like static electricity to me. If the shock sensation is continual then there is a short somewhere and electrical current is flowing through the case.

As I understand your descriptions the problem may be a loose connection or short ciruit that randomly allows or prevents. electrical current flows.

When you swapped PSUs did you use only the cables that came with each respective PSU?

My thought is that the problem may be with the case connectors - faulty connection or power button.

Another place for such problems is in and around the I/O panel. DP port being of interest.

Inspect all wires, ports, and plugs for signs of damage: bare conductor showing, melted insulation, signs of burning or overheating. Metal touching metal, missing or loose screws, corroson, swollen components.

Be sure that the system is unplugged while doing so. Use a bright flashlight and inspect carefully.

Do you have a multi-meter and know how to use it? Or know someone who does?

Overall, you must be very careful because what may be little shocks now could get worse and hurt someone.

If there is nothing found then the PC should be taken to a shop for further testing.

 

[QueendomLight]

Regarding:

"I started noticing static electricity some time ago whenever I touched the PC..."

That does not sound like static electricity to me. If the shock sensation is continual then there is a short somewhere and electrical current is flowing through the case.

As I understand your descriptions the problem may be a loose connection or short ciruit that randomly allows or prevents. electrical current flows.

When you swapped PSUs did you use only the cables that came with each respective PSU?

My thought is that the problem may be with the case connectors - faulty connection or power button.

Another place for such problems is in and around the I/O panel. DP port being of interest.

Inspect all wires, ports, and plugs for signs of damage: bare conductor showing, melted insulation, signs of burning or overheating. Metal touching metal, missing or loose screws, corroson, swollen components.

Be sure that the system is unplugged while doing so. Use a bright flashlight and inspect carefully.

Do you have a multi-meter and know how to use it? Or know someone who does?

Overall, you must be very careful because what may be little shocks now could get worse and hurt someone.

If there is nothing found then the PC should be taken to a shop for further testing.

Hello, Ralston, thank you so much for taking the time to reply to me. I have sent the GPU to a repair shop and it turns out the VRM were burnt, so apparently that is because of what you described, electric current flowing through the case.

Now that I've thankfully fixed the card (it costed a lot) I'd really appreciate your help to pinpoint where that short is coming from so that I can be able to protect it and any other components from further damage.

I've done some tests and started disconnecting everything one by one, and still got the continues electric sensation, except in one case.
* I've cut the power from the motherboard board, and left only the psu connected while it was still in the case, I still got a mild electric sensation.

* I then removed the PSU completely out of the case, then connected it to the power again and this time the electric sensation went away (while the PSU is out of the case and the motherboard power is of) ...

* I then tried connecting the power to the motherboard again (while the PSU is still outside of the case and everything else is disconnected) and this time I got that electric shock back...

So at this point I suspect it's probably something with the motherboard standoffs + the PSU missing rubber standoffs that's causing the current leakage/short.

I just don't know how to install the motherboard correctly this time so that it doesn't short like that. Is there any thing I need to take care of while installing so that I can insure that it's not going to short?

And what can I do about the missing PSU rubber standoff, could it really be one of the culbrits as I've suspected?

Any tips or help would be hugely appreciated.

I also noticed discoloration around the I/O shield on the side that's inside the case. (Like a little bit washed out rainbow colors)

And when the GPU were connected/installed to the motherboard, whenever I ran my hand on its outer chassis I feel vibration, is this normal? Could the issue be from the I/O shield itself not the motherboard standoffs?

I do have a meter I just don't know how to use it unfortunately.

Important note: I live in a country that doesn't have the third ground pin in the electric sockets. Just two pins, I don't know if that could be playing into making the issue worth or not.

Thank you so much for your time.

 

[Ralston18]

Vibrations would from fans or hard drives. But components can vibrate.

Discoloration may be the result of some current flow/heat. I/O panels can cause shorts.

Do you know someone who would know how to use your multimeter and do so safely?

Objective being to find the source of electric current.

Not comfortable on this end advising about electrical problems in other places where I am not familar with electrical codes, circuits, etc.. Especially if ungrounded.

Very likely there could be other problems as well.

I do feel comfortable recommending that you get an qualified electrician to come look things over.

There may be a bigger problem looming....

 

[QueendomLight]

Vibrations would from fans or hard drives. But components can vibrate.

Discoloration may be the result of some current flow/heat. I/O panels can cause shorts.

Do you know someone who would know how to use your multimeter and do so safely?

Objective being to find the source of electric current.

Not comfortable on this end advising about electrical problems in other places where I am not familar with electrical codes, circuits, etc.. Especially if ungrounded.

Very likely there could be other problems as well.

I do feel comfortable recommending that you get an qualified electrician to come look things over.

There may be a bigger problem looming....

"Do you know someone who would know how to use your multimeter and do so safely?"

Yes I do.

I took everything out of the case and hooked only the motherboard to the PSU and turned it on, the psu was giving mild electric shocks still.
I read that test somewhere and it stated that if the power supply still zapped then it's an issue with it. Although the old one used to gives this mild electric shocks as well. The one I'm using now is brand new, that's why I'm not so sure if that's the case.

I also noticed that the ram sticks RGB lights keeps lighting as if the PC is turned on while I'm conducting this test. (Only hooking the motherboard to the the PSU outside of the case)

Thank you for your time.

 

[Ralston18]

If two PSUs are giving shocks then there must be a common factor.

Provided that I correctly understand events, it appears that the PSUs are only providing shocks when connected to the motherboard. Is that correct?

Are only the cables that come with/came with each PSU being used with that PSU?

If the ram RGB is on while the PC switch is off that is another likely indication that electrical current is going where it should not be going. Take another look at the case connections.

Lastly, the multimeter can be used to directly test the PSU(s).

https://www.lifewire.com/how-to-manually-test-a-power-supply-with-a-multimeter-2626158

Not a full test because the PSU is not underload. However, any voltages out of tolerance indicate a faulty/failed PSU. You should have your friend help or do that testing.

The source of the current causing mild shocks must be found. Then fixed or removed as warranted.

Small shocks can become big shocks.

Be very careful.