[mythtv-users] Emergency video debug

[Alan Young]

Ian Evans wrote:
> On Thu, Jan 29, 2015 at 9:23 PM, Nick Rout <nick.rout at gmail.com 
> <mailto:nick.rout at gmail.com>> wrote:
>
>     Have you tried real simple stuff like unplugging and replugging
>     the hdmi cable?
>
>
>
> Relative was over watching a Blu-ray with the missus, so I didn't have 
> a chance due to the location of the box. When I was finally able to, 
> luckily the box came back. Just curious, how does that happen? Neither 
> the TV nor the mythbox had been moved. And I did multiple reboots. So 
> what in the physical act of re-plugging makes the change? Is it 
> something like a transient electrical blip causing the issue and then 
> the reconnecting handshake fixing it?
>
> Thanks to everyone for all the ideas.
>

Was the box off for a while? It might be possible the card is 
overheating? I don't recall if you said your card has a fan or not. If 
so, is the fan turning? Is the case getting enough airflow? Is the box 
near a heating vent? Sorry if these sound basic, I'm just trying to 
cover the bases.

Another thought is and if you are comfortable in doing it, is the heat 
sink on the card easily removable? If so, you can try removing the 
heatsink, cleaning the thermal paste off of the sink and chip and 
applying fresh thermal paste and reattaching the heatsink. Sometimes the 
paste will dry out and reapplying it allows the heatsink to dissipate 
heat properly.