PC technical help

[CAH706]

Any thoughts on this

Son has a gaming PC running 2 monitors - all was working ok. Both monitors fine.

He connected his Nintendo switch to one of the monitors via HDMI and that worked ok

When he finished playing the Switch, he re-connected the monitor back to the HDMI port on the PC

Now the monitor which was used for playing the Switch won’t work with PC. The other monitor works fine.

It’s like that HDMI port is disabled or has been damaged moving the cable

Any ideas on how to fix this or what to check?

So far
- checked monitor works on the other port and it does
- checked HDMI cable and it’s fine
- tried another HDMI cable and it doesn’t work with that

Ps apologies if that’s confusing!

[GregK2]

Powercycled both pc and monitor?

[CAH706]

GregK2 said:

Powercycled both pc and monitor?

Sorry yes, done that multiple times

[GregK2]

Does the switch still work on that same port? May narrow it down

[CAH706]

GregK2 said:

Does the switch still work on that same port? May narrow it down

Yes, we plugged the Switch back into the monitor and all works ok

Nothing has changed re connection on the monitor, leads etc.

We just can’t get the monitor to work via the Pc HDMI port that it worked perfectly well before the switch was connected to the monitor.

[Road2Ruin]

Does the monitor have different hdmi settings? The switch will probably have auto set them, but the PC may not change them back. See if there is a settings somewhere and reset or see what your options are b

[CAH706]

If I try to connect my laptop to the monitor via HDMI it works absolutely fine so it appears that the HDMI port on the PC has stopped working due to something physical ( port looks visually ok) causing a problem or another factor.

[Road2Ruin]

Have you tried another monitor from the same port on the PC? Have you also made sure that the screen is set to extended. "Windows key +p" set to extended.

[Digger]

Factory Reset the monitor in the menus?

Does the mouse cursor appear if you move it around?

Does the monitor remain powered up when connected to the PC or does it go to sleep?

[CAH706]

Road2Ruin said:

Have you tried another monitor from the same port on the PC? Have you also made sure that the screen is set to extended. "Windows key +p" set to extended.

Thanks all so far for the great suggestions

The other monitor doesn t work from that port either. The other monitor works via a USB to HDMI adapter.

The monitor not working via HDMI , will work from via the VGA monitor.
The PC only has one HGMI port

Yes - have tried selecting extended

The switch was connected for 30 minutes and has only been connected the once.

Is it possible for the HDMI connector to come away from the graphics card?

Edited by CAH706 on Sunday 14th September 18:55

[CAH706]

Digger said:

Factory Reset the monitor in the menus?
Tried that

Does the mouse cursor appear if you move it around?
No - just get a HDMI unavailable message

Does the monitor remain powered up when connected to the PC or does it go to sleep?

Remains powered up I think - power light just stays blinking

That’s for reading

[Digger]

What is the monitor model number?

[Road2Ruin]

Is it a graphics card or a motherboard with graphics output? If card, check everything is seated correctly inside. If it is the mobo, go into the bios and see of there is a setting in there that may have disabled it.

[CAH706]

Monitor model number is

GIGABYTE M28U EK 28" LED 4K Ultra HD Gaming Monitor - 3840 x 2160(4K Ultra HD)

Pc spec is
Windows 11 Home (64-bit Edition)
AMD Ryzen™ 7 9800X3D
Radeon™ RX 9070 XT 16GB
32GB DDR5 Corsair Vengeance
MSI PRO B650-S WIFI ATX Motherboard
2TB WD Blue SN580 NVMe PCIe Gen4 SSD

Edited by CAH706 on Sunday 14th September 19:02

[Digger]

Probably tried already, but change input on the monitor & back again.

Also connect to other monitor & change the resolution from current resolution (4K ?) to a lower resolution, check you get a stable desktop image & reconnect to the first monitor.

[CAH706]

Digger said:

Probably tried already, but change input on the monitor & back again.

Also connect to other monitor & change the resolution from current resolution (4K ?) to a lower resolution, check you get a stable desktop image & reconnect to the first monitor.

Thanks

I’ve played around with the input but haven’t tried the sending suggestion so will give it a go

[Inbox]

I would disconnect the monitor with the issue from all the cables including power and leave it disconnected for 10mins.

It is possible disconnecting the switch latched the HDMI interface, completely powering down and letting everything discharge could clear it.

After 10 mins connect back to PC and let us know what happened.

[2fast748]

Go into display settings and check if the PC can see 2 monitors. Sometimes setting the displays deliberately wrong then correct works with Windows. You're looking for it seeing 2 displays then checking if duplicate or extend is set.

[dan98]

As mentioned, I'd be suspicious that the HDMI port was given a pull and the graphics card should be re-seated into the motherboard.

[CAH706]

Thanks again all - really appreciate the suggestions and time

I’ll power down and leave it for a while and see if that helps

Nothing visually looks out of place but I’m no expert! PC is 2 months old so not had much messing with connection wise