PC connected to UPS, hangs w/o display on battery mode

[FordGT90Concept]

It might be stuck in C1 or C2 state.

When it does this, have you tried pushing the power button? It might pull it out of the stuck power state.

 

[Sempron Guy]

Have you gone into the BIOS and changed the power loss setting to "power off?" Default is usually "resume previous." You might be experiencing a conflict between UPS, operating system, and BIOS settings.

I do...
BIOS: power off
OS: disable sleep states, power off monitor with idle time
UPS software: 2 minutes on AC, power off.

UPS tells OS to shutdown after 2 minutes then turn itself off -> BIOS says to stay off. When power is reliably back on, I turn UPS on, then computer on. Computer is none the wiser that there was no power in that period.


I think what might be happening is that your PSU/motherboard thinks it is in a standby power state when power restores and it's not providing enough 12v for the CPU to come out of that power state so it's stuck there until it loses all power resetting the current state.

will check with the bios but aside from that I couldn't do anything else. UPS is pretty basic with no monitoring software.

It might be stuck in C1 or C2 state.

When it does this, have you tried pushing the power button? It might pull it out of the sleep state.

will give that a try

is it possible it's a power supply issue? May psu has gone through hundreds of power interruptions since I got this 3 years ago. It was only last march that I decided to get a UPS.

 

[OneMoar]

will check with the bios but aside from that I couldn't do anything else. UPS is pretty basic with no monitoring software.



will give that a try

is it possible it's a power supply issue? May psu has gone through hundreds of power interruptions since I got this 3 years ago. It was only last march that I decided to get a UPS.

change it and find out
but a decent psu should not be behaving in this manner it `should` just hard power off when it detects problem with the mains power

 

[Sempron Guy]

change it and find out
but a decent psu should not be behaving in this manner it `should` just hard power off when it detects problem with the mains power

just got another power interruption a few minutes ago, around 2-3 seconds, everything works fine no hang-ups.

 

[FordGT90Concept]

2-3 seconds, the UPS, so long as it has sufficient charge, should be able to just carry the computer through it. Maybe when you have problems, the battery doesn't have enough charge.

 

[Sempron Guy]

2-3 seconds, the UPS, so long as it has sufficient charge, should be able to just carry the computer through it. Maybe when you have problems, the battery doesn't have enough charge.

it was fully charged yesterday though when the issue kicked in

 

[OneMoar]

2-3 seconds, the UPS, so long as it has sufficient charge, should be able to just carry the computer through it. Maybe when you have problems, the battery doesn't have enough charge.

O for ffs no not even close try more like 500-900Ms before the caps can't provide enough

its not battery its not not some bios glitch the 'ups' and or psu is crapping out probably the power is got a ton of ripple in it combined with a aging psu


'ups's even crap ones are intelligent they simply will not operate AT ALL if the battery has ANY fault again the outlets on the UPS are not loosing power its NOT turning off its just not providing clean enough power

anykind of dip in voltage below about 104 to 108v and the psu should just switch off if its not its faulty and needs to be replaced

most AVR units the inverter operates FULL time e.g mains power is converted internally to 12 or 24VDC filtered and then transformed back to mains voltage this is how you get sub 50Ms switch times incoming power surges are literally shunted into the battery and ground demand for more amperage/voltage make up comes from the battery because the inverter is always on and shunted via a fast acting relay or the charge circuit just runs all the time and there is a relay that turns that on and off as needed

there is practically no switch time
ups failure is usually down to the battery being bad e.g the ups is dead or to much ripple

hook up a GOOD multimeter and yank the wall power

 

[FordGT90Concept]

it was fully charged yesterday though when the issue kicked in

How long was the outage for? Longer outage = more likely to see issue?

And as @OneMoar said, one usually tests UPS first by having nothing powered on and physically removing the plug from the outlet forcing it to the batteries. If it appears to be working fine, plug it back into the mains, turn on your equipment, and try again. If the UPS gives no signs of problems (usually beep codes or simply goes off), it's probably the computer and not the UPS.


A square sine UPS has killed two PSUs in my server. After changing it to pure sine, I haven't lost one. That said, my PSU just wouldn't turn on after turning it off. The behavior you're observing is weird.


Edit: http://www.anandtech.com/show/7950/corsair-rm1000-psu-review/5

However, some components come from manufacturers with a mediocre reputation, such as the CapXon capacitors on the secondary side of the transformer.

Maybe the source of the problem?

 

[Bill_Bright]

Have you gone into the BIOS and changed the power loss setting to "power off?" Default is usually "resume previous."

I think it is an excellent idea to check this setting, but note the default is typically "Always off". This must be changed manually by the user, and is commonly done with remote location systems so the administrator does not have to make a road trip to boot a system after a power outage.

Note that most UPS that do have software and communications have a self-test feature built in. So, for example, if you have PowerChute from APC, you can "Run Self-Test" any time you want without having to pull any plugs or shutdown Windows. Other UPS let you activate a self-test from the front panel of the UPS.

I also have two 150W incandescent lightbulbs. To test my other UPS I connect one or two lamps (depending on the size of the UPS) to the battery side of the UPS, then pull the plug and see what happens.

 

[Sempron Guy]

update: another power interruption happened around 10 mins ago. Same issue. After I did a hard reboot, i checked the event viewer which I should have done from the start of this issue and I think I may have found the culprit.

so what causes my gpu to randomly hang after a power restore from battery mode?

 

[Steevo]

voltage drop from caps dying in the PSU, most likely from squarewave boiling off electrolite and the reduced hold up time causes issues with the card as it has the shortest/lowest available capacitance to deal with voltage drops and ripple.

Power the machine off, unplug it, press the start button to discharge the PSU and then remove it, if you are brave and careful take it apart and I bet your caps are bulging. Then replace it.