HDMI cable doesn't display PC on TV but does work for cable box to TV.

[maor.grab]

I have a basic setup of a PC, 10 meter cable and an LG\Toshiba TV. A while ago my setup stopped displaying the PC on the TV screen. I tried messing around with it to fix it and eventually I left it like that since I wasn't home too much.

Yesturday I've tried again to find the source of the problem.
I have an HD capable cable box connected with an HDMI to my TV (very short cable).
So I just used this cable and connected my laptop and it worked. Connecting my laptop or PC didn't work with the 10 meter cable.

All in all, it is 100% the cable's fault. I've isolated every scenario and even switched TV's at my room, used other HDMI dongles, other GPU outputs and even a laptop.

How come a cable works with a cable box but doesn't work with a PC?
It is a cheap chinese cable but it did work for a long time with my setup..

I dont think its relevant what my specs are since i've isolated the case with 2 computers. If you think otherwise let me know and I will write it. anyway GPU is GTX460.
Thanks.

 

[Barty1884]

Does the cable box work with the 10m cable?

If I'm reading this correctly, you've tried a whole bunch of configurations, but not either of:
1. the known working cable with the unknown device (PC)
OR
2. the known working device (cable box) with the unknown (10m) cable


Your specs are relevant - as there's a magnitude of reasons your desktop would stop sending a display "out"

First of all, confirm the two points above. PC with short cable, cable box with long cable. What results do you see?

 

[maor.grab]

Does the cable box work with the 10m cable?

If I'm reading this correctly, you've tried a whole bunch of configurations, but not either of:
1. the known working cable with the unknown device (PC)
OR
2. the known working device (cable box) with the unknown (10m) cable


Your specs are relevant - as there's a magnitude of reasons your desktop would stop sending a display "out"

First of all, confirm the two points above. PC with short cable, cable box with long cable. What results do you see?

Hey Barty,

I did try those. I tried everything. again:

2 cables. a 10m chinese hdmi cable I ordered a while ago and a 1-1.5m hdmi cable I've got from my cable company with the cable box.

long cable with PC - doesnt work
long cable with laptop - doesnt work
long cable with cable box - works!

short cable with laptop - works
short cable with cable box - works
(can't try short cable with PC. too far and heavy to move lol)

so basically my question is why does the long cable (which used to work with my PC and stopped all of a sudden a while ago) still works with the cable box but doesn't work with anything else?
I've even tried bending the long cable (when connected to the cable box) to check if it has certain positions in which it works\doesn't work and it didn't make any difference.

I don't see how specs are handy in this case, as I pretty much isolated the issue.
My PC has a GTX460 1GB, i5-3470, can't recall the mobo model but it's an ASUS HM77 something.. anything else related?

Thanks for the help!

P.S. both cables are hdmi to hdmi.

 

[Barty1884]

At 10m, you have some potential issues with cheap cables.

Admittedly not my strong suit but some comments:
*Quality 10m cables have an amplifier built in
*Poor quality cables are typically ok with lower resolutions/refresh rates.

I would suspect your cable box is outputting 1080i 50Hz or 60Hz (1920x540) = 1,036,800 pixels.
Whereas your desktop/laptop is outputting 1080p 60Hz (1920x1080) = 2,073,600 pixels

And the cheap cable is just not up to the task any longer.

Admittedly, this is not my area of expertise and I could be completely wrong here