The affected units are in lot codes < 1341 (the first four digits of the S/N.
In an effort to improve our products for all of our users, we have updated the RM750 and RM850 to resolve this issue. The thermistor circuit that is used to measure the temperature for the fan controller and OTP has been changed in all RM750 and RM850 PSU’s moving forward. An additional resistor has been added that will result in the fan turning on prior to the condition that causes the PSU to shut down in the event that temperatures exceed 45°C.
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*Thanks to recent feedback provided by an early reviewer, we have discovered a PSU fan operation issue that can be triggered with the RM750 and RM850W under highly unusual operating conditions. For the issue to occur, the PSU must be run for more than 15 minutes at:
Ambient temperature 35°C (95°F) or higher
Zero ambient airflow, i.e. no airflow provided by system fans or by fans on other components*Comment has been collapsed.
one sensor always giving me 0, 57 or 122 Celsius
Ignore that. It's likely an unused sensor.
It sounds to me like a power supply issue. Try unplugging everything you can and see what happens. Ditch everything but the motherboard, CPU and RAM and power it up and see if it stays running/doesn't stay running/etc. As long as you can see a code on the POST LED, you don't need anything else to boot it.
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I'm going to echo what others have said and say it's probably a PSU issue, get a new one.
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Had a slightly similar non-boot issue many years ago when an Antec 450w PSU had leaky capacitors, only it hated booting with the new AGP videocard i put in it. Would boot with the old one, and only boot maybe 1 out of every 75 tries with the new GPU. If i was able to get it to boot, it'd usually stay running for days or weeks, but any kind of reboot would kill it and make it almost unbootable again. Eventually replaced the PSU and everything started working just fine again. Took the old PSU apart and it was clear why it was having issues, leaky caps everywhere.
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well seeing that your problem worsen afther you added more electronics, could be the wall plug, is everything plugged to the same plug?
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Probably what everybody else is saying, this reminded me of a setup that did something slightly similar to this because I had a DDR2 GPU running on a DDR3 motherboard on purpose but it would turn on instantly after turning off without any down time.
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Something VERY similar happened to me years ago. It was a hairline crack in the motherboard. Heating or bumping in just the right (wrong) way would cause a crash and reboot. It was very erratic and nothing seemed to link the reboots together as a cause. I don't remember how I figured it out. Solution was to turn it on its side and have a bit of pressure on one side of the case. As long as it was in that position it was fine. Move it and the issue returned.
Once I figured out it was somehow pressure related I was able to closely examine the system and I saw the crack. I was then able to make it reboot at will by pressing on just he right spot.
I see you may have figured it out. Hopefully you will shortly be fixed.
Speaking of PSUs. I had an issue a couple weeks ago at work I've never seen before. Although its a know issue with that unit so I was able to find and confirm I had the same issue. A blown capacitor inside the PSU. Only way to start the computer up was to plug it into the wall with the motherboard UNPLUGGED. then plug in the motherboard while the PSU had power. Then it would start. Try and start the PC with everything plugged and and you get just a blinking light and nothing powering up.
Odd. I replaced the PSU to fix it. Not good if you need to open it up and plug wires in while its powered to get the system to boot. Something about the blown capacitor was the regulator of the power rails.
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Ok, new PSU arrived (Corsair HX 750). Thought I could take a shortcut by keeping all the cables plugged in to the motherboard, GPU, etc. and just replug them to the new PSU, but the 24-pin connector is actually different on the side of the PSU so I decided to replace all of the cables, which is probably for the best.
Anyway, so far so good. Rebooted the PC a few times and had no issues so far. Will play some game for an hour or two and then try rebooting again. If that works, I think I can consider it fixed.
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GA HERE
I've already spammed half of the internet with my problem, but I didn't really get any suggestion that would move in the direction of resolving it. Maybe SG has some people that are more proficient with fixing hardware issues than I am.
Every few months I had this issue where my PC would randomly turn off and after that it would not completely start for some time. The power is on, the fans are spinning, the mobo LED is on and the graphics card LEDs are also on. There's no signal on the peripherals though, nothing at all. This would then proceed to get 'self-fixed' after 30-60 minutes of not using the PC.
Then recently I've updated my graphics card and got 2 new monitors. Since then, I'm having this issue much more frequently. It happens every few days usually, but sometimes, even a few times during one day. I've tried reseating most of the components on the mobo (except CPU), ran with my old GPU, tested different RAM in different sockets, all to no avail. It will keep being like it (no signal on peripherals for 30 minutes) and the magically start working again. I updated BIOS as well.
Then I suspected, maybe the PC is actually overheating? So I started monitoring the temperature more closely, couldn't find any abnormalities except one sensor always giving me 0, 57 or 122 Celsius (https://imgur.com/a/JtgSEHf), I think it's the monitoring tool error though (HWMonitor). What's more, it seems the issue persists even if the PC has been running for a few minutes. I can literally turn it on, boot Windows and turn off and it will not completely boot again.
Yesterday, it crashed again and instead of the usual 'turned on but actually off' it stopped working at all and trying to boot it up resulted in the mobo and GPU LEDs flashing once and fans just spinning for a second and then turning off. I thought it's really dead so I took it apart again and replaced the GPU with the old one, tried different RAM sticks and in the end it went back to the 'on but off state' and after 20 minutes it booted again. I used it for a few hours, turned it off, decided to try turning it on and of course it's not possible.
I think like I'm running out of options here, not sure what else I can do or how I can properly test other components (got no other mobos/PSUs to test with).
My setup:
EDIT: Ok, thanks everyone, I've ordered a new PSU, so tomorrow after work I should be able to see if it worked.
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