Something very weird is going on with my home theatre PC

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Bitwit

[Bitwit]

It's worth noting that there are more dislikes than usual because I told people to dislike the video in the video. OK bye.

[GregSalazar]

Yo! I have used that same case a few times. With the way the cables need to be routed, it can be quite easy to puncture a PSU cable with one of the screws that holds the three-sided removable panel in place. The PSU may have shut off and prevented itself from powering back on if it detected that short. And, of course, this would remedy itself if the panel was removed and reinstalled in such a way that the screw was no longer making contact with the wiring under the insulation. Would be pretty strange if you were experiencing the _same_ thing with your rig, but maybe this story will get the creative juices flowing! :-D

[heinsteup]

Possibility: Overheat protection triggered, power spike due to the sudden shutdown and this caused a resettable fuse to cut out. Once the power was removed the fuse auto-resets and all is good in the land of opportunity. 🤔

[aidenonkbm]

ive never felt so sad when kyle goes to the graphics card aisle :’) omg he has so many

[MichaelKaufman]

I’m assuming the PSU tripped from a thermal event, and latched off while there was 120V supplied to it. I believe unplugging it for an extended amount of time let the capacitors de-charge and the thermal protection to de-energize to un-latch the circuit returning it to a non-fault state

[James-jmhp]

Honestly, i've read the comments and watched the video twice. I'm leaning toward PSU. The corsair SF600 is only a 600 powering a 3080. My 6700xt randomly shuts off due to OC on the card pulling up to 230 watts. Plus the 10700k @5.3 on all cores pulls 200-225 under hard loads. I'm running a 650 and swapped to a 850 and never had the problem again. Also im pretty sure a 3080 requires a 750w PSU or higher. I would start there. Even the 2080 super requires a 650. 3070 is a 550 I think. Again that's where I would start. Hope this helps! Also when you throw that much heat build up inside an unvented box, you get thermal resistance. Just meaning electricity flows better throw cold martials rather then hot. Given those factors, I would go with a 750 or a 850.

[rush]

Psu thermal shutdowns, or even over current protection circuits don't usually get reset until AC power is completely removed.
You probably never unplugged the power cord to reset it until you moved it.

[jameslarsen]

Best Guess:

The PSU is rated 600 Watts.

This is *really* pushing it for the power spikes in a 3080. What probably happened is an over current projection fired in the PSU. In some cases resetting components requires a full discharge, meaning removing from power and allowing them to sit for a while. In my industry we deal with older (core 2 quad) servers that often resume normal function after being discharged, including this exact same scenario. (Note, when I say discharge I'm not talking about the high capacity capacitors in the unit, these don't discharge being set dormant). The PSU was probably reading itself out of spec until it sat without power for while, and is now revived.

The recommended wattage on a 3080 is 750 Watts. This has been largely more accurate than in previous generations due to power spikes on these cards. If that SFF psu isn't really up to snuff the 3070 may also have issues some time down the road.

[LividCreature]

In my HTPC it was also in a TV cabinet like that and my trick was to use a small fan to blow cool air in to the cabinet doors (they were mesh). However, I ended up getting a really cool USB fan that was powered by the PC and angled it so the hot air was continually being vented through the back of the case (it had little holes and the cable hole) and it worked great. Of course it all depends on your ambient temps. But just simply venting the hot air in the cabinet out the back gave me solid temps,

[osman_malak]

Kyle, I would cut out the back of the cabinet and either use an active fan or buy some black mesh and attach it to the cabinet. I had a similar issue with my entertainment unit and cutting the back helped immensely

[BrentTech]

Here's my guess: It had a thermal shut down incident... and didn't reset the sensor until you fully removed power from the system (discharged capacitors?) and fully drained power from the PSU and/or motherboard. I've seen this on many machines in the past (though not usually thermally related).

In the future, if it happens again (or if you are brave and want to try to recreate the issue), open the doors, let it cool down for an hour, unplug the power cable, hold down the power button for 10 seconds or so to fully discharge voltage, then plug it back in and power on.

[acshih]

So I had the same issue with a particular PSU.. once it "tripped" on over temp (don't ask).. It wouldn't reset until I "unplugged" it. Not just use the powerswitch on the PSU but physically unplug it. I would do the same as you, moved the pc to my office to work on it... and voila turns on as normal, brought it back to place of operation, still works.. until the next time it happened.

This happened a few times with that particular PSU in the use case I had, until I eliminated the "overheating" issue.

I've never had any such issues with other PSU brand thus far though, even in similar conditions..

just my (Jayz)2 cents here.. :)

[CyclingMikey]

I just had that on my kid's computer - took everything out, put it back in, and it booted fine. Doh!

[Blobber.t]

Tip: take the glass out of the cabinet doors and replace them with fans? Can improve thermals in the area so negative pressure in the case. However exhaust will go into the room making it warm

[BryanThePirate]

Half the time it's just the cables shifting in their ports due to changes in temperature. I work in tech support in the UK and we get this a lot especially when the seasons/weather dramatically changes from hot to cold or vice versa.

For those that don't get why: if you heat a solid up, it expands, if you cool it down it can often shrink. Sometimes all it takes is a couple of microns for a cable to not be able to work. Especially in a tightly packed small form factor case where there may be added pressure on the cables in some places.

[jacobwisner]

I've found that when some kinds of protection on some PSUs get tripped I have to disconnect the system completely from power for a few minutes before it will attempt to boot again. Maybe that's it? Maybe disconnecting it long enough to drag it to the office got you that?

[PEDoers]

Kyle, its a PSU problem all the way. I have seen some overheat and shut off (due to over-current draw), then once the inductors and and capacitors cool down completely (like to complete ambient temp plus a few days), the over-current will finally reset (remember those discreet components tend to hold a charge). In many cases they come come back to life.

BTW, I am an 'Old School' Engineer that has seen that happen on legacy Power Supplies in mainframe computers (you would never believe the size of those monsters). We even had a procedure for forcing a quick but controlled discharge of the capacitors and associated inductors to speed things along - using resistive loads). Just beware however, that it is VERY likely at least one of the large capacitors has been over-stressed (with a weakened dielectric layer that will fail very soon). In the Mainframes (since I was part of an engineering support team), we would recommend that all the capacitors be replaced withing the Power Suppy, and that an inspection be done on the inductors (including the solder joints), for discoloration. The bottom Line: I suggest you replace the PSU.

[Verzox]

I was very confused to see James Pumphrey on this particular channel but it all makes sense now. MO POWA BABY!

[WolvenSpectre]

Something most people overlook is the northbridge. If it gets to hot it can throttle bandwidth between the CPU and GPU and it will look like it is thermal throttling one or both, but temps are fine. If it rapidly heats up sometimes the cooling solution and the northbridge can start to seaperate and it will shut down. It can also be the power switch on the case while hanging open formed an open connection in the wire that keeping it hanging kept the power switch from working.

Some power strips when in use by several things and one trips the protection on it you have to leave it unplugged from that socket while using the other sockets for a while before it will reset.

but to use the old hacking term it is most likely Deep Magic.

[warrenstamps]

Some power supplies have a safety when they get too hot. They trip it and you have to unplug the power for a bit and then plug it back in for the power supply to reset.