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A Desktop PC built from off-the-shelf DIY parts, rather than a prebuilt from a major manufacturer. These can also be built by an SI using off-the-shelf parts.

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DP NO SIGNAL Error

Hello, just tonight my son's PC crashed as I was updating his Windows and now the PC turns on but no display through his graphics card. On monitor 1 I get DP NO SIGNAL (his MSI31"connected via display port to his graphics card) and HDMI NO SIGNAL to his 2nd monitor, connect via HDMI. Tried other ports on card, even tried a different card, and direct to mobo. Same result. It's late so tomorrow is plan to try connect tower to his brothers set up to see if his monitors show up. And also connect my laptop to his displays to see if that comes on. But I'm the meantime I was hoping maybe someone here might have any ideas, thoughts or similar experiences? Any help would be greatly appreciated!

CPU:amd Ryzen 7 5700x
CPU cooler: cooler master i70c
Motherboard:MSI B550m PRO VDH
Ram: Vengeance 16GB (8x2)
SSD/HDD: WD BLACK 1TB SN770
GPU: gigabyte rtx3060 12gb
PSU:EVGA 750 bq
Chassis:
OS:W11
Monitor: MSI 31" via display port and Asus 27" via hdmi

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Hi @jessehookano

Can you get into BIOS on startup with a working display?

Are any of the EZ Debug LEDs on the motherboard turned on?

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Negative on the BIOS. I can't even get into safe mode or the bios. As soon as I turn on I get the DP/HDMI NO SIGNAL. displays never go on so maybe I am in BIOS or whatever, I just can't see it.

As for the EZ debug thing I'll have to look into it, I don't even know what that is. Can you tell me what that does?

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@jessehookano

Go to p.41 in the user manual to see the location of the EZ Debug LEDs and what they are for.

If it's a boot problem, try creating a recovery disc and check if booting from it helps to restore the PC.

You can create a recovery disc from any known working Win11 PC. All you need is a 32GB flashdrive and 1-2 hours of time.

In the host PC go to Control Panel > Recovery > Create a recovery disc and follow the prompts.

When you have the drive insert it into the PC and see if it boots from the drive and into the Windows Recovery Environment menus.

If it does, go to Troubleshooting > Advanced > Startup repair and follow the prompts.

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I don't think it's boot problem. I'm wondering if it's motherboard. I hooked a laptop up to the HDMI and it shows on the display. I don't a have DP adapter but I have a feeling it would work too. DP and HDMI cable direct to the Mobo doesn't work. I'm going to take it all apart and clean and rebuild. Doubt it will work but it's all I can do with what I have and not buying new stuff yet

Oh of note, regarding the EZ DEBUG LED. I think it's in the right of the Mobo just next to the power harness and the CPU LED is lit white. At least I think that's it

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@jessehookano

CPU or GPU it should be marked on the board?

Try a power refresh i.e. turn off PC (if on) and disconnect power cord to the PSU and then remove the coin cell battery from the motherboard.

Press and hold the Power button operated for 30 seconds then release.

Reinsert the coin cell battery into its holder (+ve side up), reconnect power to the PSU and check if it turns on OK with a display and no EZ Debug lights on

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It's cpu. Upon removing it, I found pins bent. Not sure if it was like that or jarring the cooler did it. But before I even tried removing it, the led was white. Either way now I ordered a new CPU. But I have a weird feeling that was not the problem. I'm hopeful though

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@jessehookano

I would have thought that bent pins on the CPU would have shown up before now as a problem.

Use the paperclip test to check if the PSU is OK in case there's a problem there with a power supply to the motherboard.

Also if the CPU pins aren't bent that badly, you could try using a credit card to gently, stress gently, bend them back up straight again.

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Ok here's the situation now.

My laptop connected to monitors. Display comes on.

Pc to monitors via DP and HDMI cable in the video card. Display doesn't come on

PC to monitors through motherboard. Display doesn't come on.

I am never able to boot, not in safe mode, BIOS, nothing.

MSI debug LEDs on motherboard had white light under CPU. Removed CPU and found pins bent.

Paperclip test was good, can came on.

Put new CPU in today, still no display through either video card or motherboard.

Do you think a new motherboard is in order? Because I'd hate to reformat/reinstall windows and everything only to find that wasn't the problem. Hate to lose everything of incident need to, but I really am at a loss now.

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You mentioned that the PC crashed when your son is updating Windows. Have you tried to boot the PC from another drive with Windows installed that's known to work? If the system is somehow corrupted during the update it should at least boot into BIOS but try another drive just to be sure.

Also, I don't think the cpu is to blame. The Ryzen 5000 series uses the AM4 socket, which consists of pins that goes into a socket with holes on the mobo, if I'm correct. The pins on the CPU should automatically align themselves when fully inserted into the holes and make contact with the socket when you install the cpu, so slightly bent pins shouldn't cause any problems if it fits. If it doesn't work even if you insert it the right way, then the socket on the mobo might be cracked and causing connection issues. Also, the pins shouldn't bend in the socket, so I suspect the socket on the mobo is the issue here.

Can you post a picture of the bent pins on the cpu so we can see what's going on?

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@Leooooo1061 I do think now that the motherboard is the issue. On the old cpu the pins weren't slightly bent, some were pretty bad, and all along the edges. New CPU mounted to old motherboard fine, and came out ok, it just didn't boot with a display. Sorry I am at work and the CPU is at home.

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@jessehookano did you try a new hdmi cable? Or a new display? Seems to be the least likely case but just to make sure, since now all the components are new.

Also, the HDMI ports themselves might be broken, either on your motherboard, your graphic card, or your display. Try a new cable and connect it to your tv if you have one.

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I didn't try other cables as the HDMI connected monitor comes on when connected to my laptop. On the PC, that's 5 different HDMI ports that doesn't give signal. I can't imagine all 5 being bad. But 3 actually, as I just learned that the CPU determines integrated graphics functionality. Never knew that

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@jessehookano Well at least that's ruled out. Your computer's issue is really weird, though. Right now you've got a new mobo, a new CPU, and a new psu, and it still won't boot? Did you try new RAM sticks? In some cases the RAM sticks are simply incompatible with the CPU or mobo for no reason at all. On my pc I had to try 3 different brands of RAM to get it to boot.

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Also, can you post a picture of the diagnostic LEDs of your mobo after you power it on? Maybe that can help us locate the issue.

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