Question My monitor turns off when room light on/off

[moking01]

Ive been having this strange behavior of my PC. I have my PC in my bedroom and whenever i turn on/off the lights or even the fan in the same room or the living room my monitor shuts off for like 3 seconds and if im playing a song i lose sound for the same period. Then it turns on again as well as sound.
After a while from every incidense, my monitor shuts down completely as well as sound, but the case itself remains powered on (aio, hdds, mouse, keyboard).

• I thought of a faulty PSU (had a seasonic s12ii 520w) so i replaced it just yesterday with a gigabyte aorus p750w gold certified and the same also happened.
• Ran an AIDA Systest for 2 hours to stress all parts and check for stability and it went smooth.
• My RAM passed a 4 phases memtest

Im in desperate need for help as im building a whole new system and i dont want that to happen with my new rig too.

Current build
Ryzen 1600
Asus strix f b350
16gb corsair vengeance 3000
gtx 1060 3gb windforce
ssd kingstone a400
wd 1tb blue
seasonic s12ii 520w bronze

Would a Voltage Stabilizer or a UPS solve this issue? Since i dont really know what causes it in the first place..... very frustrating

 

[TypoFairy©]

ups would solve the issue since it would kick to battery for the split second when the electricity drops. If you own the home u might want to have an electrician take a look at it.

 

[Mantrid-Drone]

This sounds more like either a power settings or a home electrical wiring issue to me than a system fault.

The electrical switching may be triggering it and a simple drop in current may be just enough to send the monitor into power saving mode. If your PC/monitor is set to a power saving mode try switching that off and see if the problem persists.

I have a minor annoyance with my PC which may be caused for similar reasons. If I put the PC into Hibernate turning on some other electrical equipment in the house can wake it. Turning it off does not have the same effect which suggests that a voltage increase from that which existed at the point of Hibernation is not a trigger. That certainly doesn't match moking01's description if both on and off are having the same unwanted effect.

The odd thing is that my problem is inconsistent too and not, as you'd think, always devices near the PC or even attached to the same surge protected extension block. That I do not understand, as well as that many of the other devices I've tested to try to provoke the same effect are using the same mains ring circuit.

I'll be interested to know if anyone else has had similar problems to moking01 and can suggest a solution that does not involve rewiring the house.

 

[moking01]

ups would solve the issue since it would kick to battery for the split second when the electricity drops. If you own the home u might want to have an electrician take a look at it.

And what if the electricity spikes ? My monitor sometimes goes off when light off.

This sounds more like either a power settings or a home electrical wiring issue to me than a system fault.

The electrical switching may be triggering it and a simple drop in current may be just enough to send the monitor into power saving mode. If your PC/monitor is set to a power saving mode try switching that off and see if the problem persists.

I have a minor annoyance with my PC which may be caused for similar reasons. If I put the PC into Hibernate turning on some other electrical equipment in the house can wake it. Turning it off does not have the same effect which suggests that a voltage increase from that which existed at the point of Hibernation is not a trigger. That certainly doesn't match moking01's description if both on and off are having the same unwanted effect.

The odd thing is that my problem is inconsistent too and not, as you'd think, always devices near the PC or even attached to the same surge protected extension block. That I do not understand, as well as that many of the other devices I've tested to try to provoke the same effect are using the same mains ring circuit.

I'll be interested to know if anyone else has had similar problems to moking01 and can suggest a solution that does not involve rewiring the house.

I will start troubleshooting by going with the least expensive solutions. I ordered a not so expensive surge protector and i will connect all power cords to it.
Next should i go with UPS or Voltage stabilizer ? And do i get any of them based on the rated wattage of my PSU ? Or i should consider other elements too such as fans, AC system, monitor...etc ?

 

[Mantrid-Drone]

I doubt the surge protector will help - I have a 8-gang extension socket with surge protection built in for the monitor and modem/router. The PC has its own surge protector and plugged into a completely different wall socket. Yet I still get the wake Hibernation issue described.

A voltage stabiliser would make more sense than an UPS (Uninterrupted Power Supply) which is basically just a battery that kicks in immediately when there is a power failure. They do smooth voltage spikes and sags but whether that would included the likely micro-voltages involved in triggering the event described I have no idea.

Both seem like expensive solutions and that assumes they work. I'd be changing the 'problem' PC's power settings and testing whether altering any of those help first.

 

[moking01]

I doubt the surge protector will help - I have a 8-gang extension socket with surge protection built in for the monitor and modem/router. The PC has its own surge protector and plugged into a completely different wall socket. Yet I still get the wake Hibernation issue described.

A voltage stabiliser would make more sense than an UPS (Uninterrupted Power Supply) which is basically just a battery that kicks in immediately when there is a power failure. They do smooth voltage spikes and sags but whether that would included the likely micro-voltages involved in triggering the event described I have no idea.

Both seem like expensive solutions and that assumes they work. I'd be changing the 'problem' PC's power settings and testing whether altering any of those help first.

Its very interesting to brainstorm with someone with the same pain lol. So here is what happened last night.
I was going to bed and left the PC on and just turned off the monitor as i had a gigantic download running. Then i thought i forgot to close something so i tried to turn on the monitor again...but no. It wont detect signal (No HDMI cable connected).
For the first time, i tried to unplug its power cord and connected it to a different wall socket (i have around 6) and it worked!!
In the morning i turned on the room lights...monitor went off...tried a different wall socket and again it worked. So now im suspecting a not very stable current coming out of the wall sockets, a faulty monitor (less likely) or a faulty power cord (changed it this morning).
On the bright side, that eliminates the possibilities of hardware issues (CPU, GPU, PSU, Mobo...etc).

Also the power settings from windows didn't help.

 

[ch33zw1z]

That circuit is trouble. I'm curious what a multimeter would report as the light is turned on/off. Sounds like some electrical work is needed.

 

[moking01]

That circuit is trouble. I'm curious what a multimeter would report as the light is turned on/off. Sounds like some electrical work is needed.

I think my home wiring is a mess indeed. Should i try to test the volt readings with a multimeter during light on/off ?
And im trying to find a solution that wouldn't have me rewiring the house. Like a Voltage Stabilizer or something...

 

[ch33zw1z]

I think my home wiring is a mess indeed. Should i try to test the volt readings with a multimeter during light on/off ?
And im trying to find a solution that wouldn't have me rewiring the house. Like a Voltage Stabilizer or something...

I would check it, but that's me. You can also try a plug-in circuit checker. It may be something simple, I'm not really saying to rewire everything, lol.

A voltage stabilizer may work, but it shouldn't be a long term solution. It's a good idea to try and figure out why the voltage is so low

 

[DamZe]

Most likely electrical wiring issue, I've had similiar happen to me once I moved to another place with more robust infrastructure it never happened again.

 

[moking01]

I have checked the voltage reading on a multimeter and i should be getting 220v out of the wall sockets. Thats the standard in where i live. However, i get about 214~216V.
I dunno if that little difference in voltages could be the cause of my issue here or not...could anyone tell ?

 

[Mantrid-Drone]

That is almost certainly within whatever country you're in mains supply specs. In most of the EU and the UK the voltage supplied has been specified to be 230v +10% -6% ie. between 216v - 253v for over a decade.

That means any electrical equipment for use in the EU or UK must be certified to be safe and work within those parameters. Australia, New Zealand and many other countries around the world have adopted similar standards too.

Your wall socket would appear to be at the lower end though. This is most likely because the mains standard where you are is 220v rather than 230v. For most equipment that should make no difference but when we're talking about the small voltages probably involved in triggering the problems described it may do.

Have you tried turning off the Sleep or Hibernation options and testing if the problem repeats with those disabled?

 

[moking01]

That is almost certainly within whatever country you're in mains supply specs. In most of the EU and the UK the voltage supplied has been specified to be 230v +10% -6% ie. between 216v - 253v for over a decade.

That means any electrical equipment for use in the EU or UK must be certified to be safe and work within those parameters. Australia, New Zealand and many other countries around the world have adopted similar standards too.

Your wall socket would appear to be at the lower end though. This is most likely because the mains standard where you are is 220v rather than 230v. For most equipment that should make no difference but when we're talking about the small voltages probably involved in triggering the problems described it may do.

Have you tried turning off the Sleep or Hibernation options and testing if the problem repeats with those disabled?

The thing is, yesterday when i measured it was the first day in a while when my PC/monitor didn't shut down. Is it a coincidence that my voltage readings where normal ?
As a work around, do you think a voltage stabilizer can eliminate this issue ?
And no the sleep and hibernation didnt help

 

[ch33zw1z]

The thing is, yesterday when i measured it was the first day in a while when my PC/monitor didn't shut down. Is it a coincidence that my voltage readings where normal ?
As a work around, do you think a voltage stabilizer can eliminate this issue ?
And no the sleep and hibernation didnt help

If this has been a constant problem, continue to measure. Also, figure out what else is on the circuit, as it's likely something else being turn on is drawing enough power to cause the monitor problem

 

[Mantrid-Drone]

As the cause of the problem has been narrowed down to the mains electrical supply I'd assume a voltage stabilizer would resolve it whether it is under or over voltage.
But this is a specific case and the affects very obvious and I'd suspect until you actually try it out you're not going to know if it works.

On Amazon/eBay a basic but decent quality voltage stabiliser/regulator is going to set you back £50 - £100 ($60 - $120) and there are some much more expensive ones available too. That is a major outlay for a solution which may not work. If you're willing to shell out that sort of money getting in a qualified electrician to sort out your wiring may be the more sensible course of action.

They might be able to give you a free quote for whatever work needs doing and, who knows, maybe even diagnose exactly where the problem is and offer a solution without it costing you an arm and leg. I think that unlikely but it is worth considering.

 

[moking01]

As the cause of the problem has been narrowed down to the mains electrical supply I'd assume a voltage stabilizer would resolve it whether it is under or over voltage.
But this is a specific case and the affects very obvious and I'd suspect until you actually try it out you're not going to know if it works.

On Amazon/eBay a basic but decent quality voltage stabiliser/regulator is going to set you back £50 - £100 ($60 - $120) and there are some much more expensive ones available too. That is a major outlay for a solution which may not work. If you're willing to shell out that sort of money getting in a qualified electrician to sort out your wiring may be the more sensible course of action.

They might be able to give you a free quote for whatever work needs doing and, who knows, maybe even diagnose exactly where the problem is and offer a solution without it costing you an arm and leg. I think that unlikely but it is worth considering.

I have not had a single shut down in two days so far. Yesterday -out of curiosity- i checked the wall socket readings and they were 220v stable. So im guessing im having a fluctuating voltage or in other words random voltage drops. Thats more related to the main elec line going into my home from the street i guess ?
Im guessing an electrician can't resolve how much voltage im receiving from the main line...or at least set me to a fixed voltage. Or can he ?
I might be in a need of a voltage stabilizer to make sure im getting 220v at any given time.

 

[moking01]

Problem solved.... i guess. I swapped the HDMI cable to a brand new high quality one and didnt have any issues so far.
I was trying cheap options first and i guess that worked lol.
Thanks everyonr for your support.