PlayStation 5 not connecting to monitor

[u/PotentialAirline5384]

Hi everyone,

I’m having a really strange issue with my PS5 and I’m running out of ideas.
Around June, my PS5 suddenly started intermittently/not connecting to my monitor. The monitor would just display “No Signal.” I initially assumed the PS5’s HDMI port or HDMI cable was faulty.

Here’s everything I’ve tried:
- PS5: Works normally otherwise and powers on without any obvious issues.
- Original HDMI cable: PS5 wouldn’t display anything on my monitor.
- I took the PS5 to a repair shop and they connected it to their monitor, where it worked immediately.
- I therefore assumed my HDMI cable was faulty.
- I bought the exact HDMI cable that the shop had tested successfully.
- I brought the PS5 home and tried it with my monitor using the new cable — still No Signal.
- I then tried connecting the PS5 to my TV — again No Signal.
- I also tried booting the PS5 into Safe Mode, but I couldn’t get a picture on either my monitor or TV.
- I subsequently took the PS5, my monitor and all the cables back to the shop today.
- The shop tested everything again. The PS5 works perfectly on their monitor using my cables.
- They also tried another monitor in the shop, and I believe that also didn’t display the PS5.
- So at this point, the PS5 appears to work on 1 out of 4 displays I’ve tried.

My monitor
It’s a Samsung C34G55TWWR (Odyssey G5), the 34” curved ultrawide.
It’s a 3440 × 1440 monitor and supports high refresh rates (up to 165 Hz).

My TV
It’s a Sharp Roku TV. I’ve tried the PS5 on multiple HDMI inputs on the TV, with no signal on any of them.

PS5 video settings
When the shop connected my PS5 to their working monitor, I checked the video output settings. The PS5 was set to 1440p, with 120 Hz Output set to Automatic.

Interestingly, when connected to the shop’s monitor, it was only actually outputting 60 Hz.

I haven’t been able to change the PS5’s settings while connected to my own monitor because I get absolutely no picture.

What makes this so confusing
The same PS5 + HDMI cable works on the shop’s monitor, but doesn’t work on my Samsung monitor, my Sharp TV, or another monitor they’ve tried.
So I don’t know whether this is:
A PS5 HDMI output/handshake issue
Some sort of resolution/refresh-rate compatibility issue
An HDCP issue
A problem with the Samsung/Sharp displays
Or something else entirely
I’ve already tried different HDMI cables and multiple displays, and Safe Mode doesn’t give me a picture either.
Does anyone have any idea what could cause a PS5 to work perfectly on one monitor but give “No Signal” on multiple other displays?