My Computer Monitor goes OFF while System stays ON.

michael · Feb 23, 2014

Hi Guys,

I have recently started experiencing very unique problem.
After using computer for few hours suddenly the Monitor goes off, while system stays ON, then I check my Motherboard Asus LED code it shows "AO" which it normally shows when all is OK.

So I restart my PC and then the Monitor starts after system reboots.

I really don't know what is the problem here?

System Name:To be ALL IN ONE MACHINE. but not yet
Processor:i7 3770k
Motherboard:Asus P8Z&&-V Deluxe
Cooling:Thermalright Silver Arrow
Memory:Gskill Ripjaws 1600Mhz 8GB *4 = 32GB
Hard Disk(s):Samsung pro 840 256GB, Segate 3TB and 1TB
Optical Drive:Transcend portable
LCD/CRT Model:LG 23" Full HD LED
Case:Antec LanBoy Air
Power Supply:Cooler Master M2 Silent Pro 850 Watts
Software:Windows 7 ulimate 64bit

I am also using APC Back-UPS Pro 1500. so there is no chance of Power fluctuation.

Please advise.

Hugis · Feb 23, 2014

I see you have an LG monitor, i had a similar issue some time ago, i had to RMA the monitor.
They changed a power board inside the monitor.......
It can only be monitor or graphics really, first try the monitor on a different system then check the card if the monitor doesn't go off on a different system..

micropage7 · Feb 23, 2014

what about resetting your monitor setting first
and check button light on your monitor, is that normal (like red when on and yellow when standby)

FreedomEclipse · Feb 23, 2014

I had a similar issue with a laptop, turned out to be the light tube inside the screen that was dying/dead.

I dunno about desktop monitors but if its not the inverter (which is the power circuit) then its the light tube

de.das.dude · Feb 23, 2014

does turning off the monitor mains and turning it back again work? if it does, probably the monitor is faulty.

DLGenesis · Feb 23, 2014

i had monitor that would kind of like turn it self off and on. the monitor was faulty. its not like it just turns itself off, just goes blank

michael · Feb 23, 2014

micropage7 said:
what about resetting your monitor setting first
and check button light on your monitor, is that normal (like red when on and yellow when standby)

Ohh yes, Right. When this problems occurs, My LEd Monitor does not even show Red or Blue LEd light even after I press ON and Off button.

I wish it is monitor problem.

@dedasdude:- Yes I will follow what you said that will help me know the issue well.

and however as Motherboard LEd keeps showing "AO" during monitor OFF phase so I think no problem with my motherboard.

Derek12 · Feb 23, 2014

Does the computer freeze ie caps lock led not responding, sound stopping, pinging from another pc not responding when the monitor shuts down?Try to unplug the monitor power cable and plug it again after it shutsdown

michael · Feb 23, 2014

Ohhhh Yes..

I do Thanks a lot for all for replying...

I am so happy that my Highly configured CPU has nothing to do with this Monitor shutdown as when it happened now I just tried to unplug the main power supply from my UPS and tried to plug it initially I could see no response on Monitor even Led on it was not blinking so I waited for 5 more minutes and tried again this time my Monitor Blue Led blinked and my Computer windows appeared with same screen which was there before Monitor shuts Off.

I really Love this techpowerup.com forum all users here are damn helpful and knowledgable .
:rockout:

de.das.dude · Feb 23, 2014

try running the monitor on direct power. UPSes dont really give identical power output. so a lot of things can often malfuncion.

GayleShier · Feb 26, 2014

but running the system on direct power can be more risky and can cause more trouble even

FreedomEclipse · Feb 26, 2014

GayleShier said:
but running the system on direct power can be more risky and can cause more trouble even

I doubt many people can afford to purchase a UPS for everyday use. Ive never used a UPS since I started with computers back in 90s and have never had a problem. I can count the amount of powercuts/outages ive had since then on one hand and its really not much of an issue unless you do a lot of important work on your PC/Laptop or for some reason the electricity in your house is just 'dirty' so you use the UPS to smooth it out.

theres no real need for a UPS for the average user.

de.das.dude · Feb 26, 2014

this ^ a good power supply is better than any ups. my power supply even saved from lightning strike on the house.

System Name	Office / Gamer Mk IV
Processor	i5 - 12500
Motherboard	TUF GAMING B660-PLUS WIFI D4
Cooling	Themalright Peerless Assassin 120 RGB
Memory	32GB (2x16) Corsair CMK32GX4M2D3600C18 "micron B die"
Video Card(s)	UHD770 / PNY 4060Ti (www.techpowerup.com/review/pny-geforce-rtx-4060-ti-verto)
Storage	P41Plat - SN770 - 980Pro - BX500
Display(s)	Philips 246E9Q 75Hz @ 1920 * 1080
Case	Corsair Carbide 200R
Audio Device(s)	Realtek ALC897 (On Board)
Power Supply	Cooler Master V750 Gold v2
Mouse	Rii M01(3360Sensor)
Keyboard	Logitech S530 - mac
Software	Windows 11 Pro

System Name	micropage7
Processor	Intel Xeon X3470
Motherboard	Gigabyte Technology Co. Ltd. P55A-UD3R (Socket 1156)
Cooling	Enermax ETS-T40F
Memory	Samsung 8.00GB Dual-Channel DDR3
Video Card(s)	NVIDIA Quadro FX 1800
Storage	V-GEN03AS18EU120GB, Seagate 2 x 1TB and Seagate 4TB
Display(s)	Samsung 21 inch LCD Wide Screen
Case	Icute Super 18
Audio Device(s)	Auzentech X-Fi Forte
Power Supply	Silverstone 600 Watt
Mouse	Logitech G502
Keyboard	Sades Excalibur + Taihao keycaps
Software	Win 7 64-bit
Benchmark Scores	Classified

System Name	Codename: Icarus Mk.VI
Processor	Intel 8600k@Stock -- pending tuning
Motherboard	Asus ROG Strixx Z370-F
Cooling	CPU: BeQuiet! Dark Rock Pro 4 {1xCorsair ML120 Pro\|5xML140 Pro}
Memory	32GB XPG Gammix D10 {2x16GB}
Video Card(s)	ASUS Dual Radeon™ RX 6700 XT OC Edition
Storage	Samsung 970 Evo 512GB SSD (Boot)\|WD SN770 (Gaming)\|2x 3TB Toshiba DT01ACA300\|2x 2TB Crucial BX500
Display(s)	LG GP850-B
Case	Corsair 760T (White)
Audio Device(s)	Yamaha RX-V573\|Speakers: JBL Control One\|Auna 300-CN\|Wharfedale Diamond SW150
Power Supply	Corsair AX760
Mouse	Logitech G900
Keyboard	Duckyshine Dead LED(s) III
Software	Windows 10 Pro
Benchmark Scores	(ノಠ益ಠ)ノ彡┻━┻

System Name	Monke \| Work Thinkpad\| Old Monke
Processor	Ryzen 5600X \| Ryzen 5500U \| FX8320
Motherboard	ASRock B550 Extreme4 \| ? \| Asrock 990FX Extreme 4
Cooling	240mm Rad \| Not needed \| hyper 212 EVO
Memory	2x16GB DDR4 3600 Corsair RGB \| 16 GB DDR4 3600 \| 16GB DDR3 1600
Video Card(s)	Sapphire Pulse RX6700XT 12GB \| Vega 8 \| Sapphire Pulse RX580 8GB
Storage	Samsung 980 nvme (Primary) \| some samsung SSD
Display(s)	Dell 2723DS \| Some 14" 1080p 98%sRGB IPS \| Dell 2240L
Case	Ant Esports Tempered case \| Thinkpad \| Antec
Audio Device(s)	Logitech Z333 \| Jabra corpo stuff
Power Supply	Corsair RM750e \| not needed \| Corsair GS 600
Mouse	Logitech G400 \| nipple
Keyboard	Logitech G213 \| stock kb is awesome \| Logitech K230
VR HMD	;_;
Software	Windows 10 Professional x3
Benchmark Scores	There are no marks on my bench

System Name	Niblolkik
Processor	i7 4930k 4400mhz (1.285v)
Motherboard	ASUS Rampage IV Extreme
Cooling	Corsair H80, 6x NF-F12, 2x Gentle Typhoon
Memory	4x4 16gb G-Skill 2133mhz
Video Card(s)	780 SLi
Storage	Samsung 840 500gb
Display(s)	Asus Swift
Case	Antec
Audio Device(s)	Creative Soundblaster ZX
Power Supply	850watt Antec QuattroTP
Mouse	Corsair m65
Keyboard	Tt
Software	Windows 10 64bit

My Computer Monitor goes OFF while System stays ON.

michael

Hugis

Moderator

micropage7

FreedomEclipse

~Technological Technocrat~

de.das.dude

Pro Indian Modder

DLGenesis

michael

Derek12

michael

de.das.dude

Pro Indian Modder

GayleShier

New Member

FreedomEclipse

~Technological Technocrat~

de.das.dude

Pro Indian Modder

System Name	To be ALL IN ONE MACHINE. but not yet
Processor	i7 3770k
Motherboard	Asus P8Z&&-V Deluxe
Cooling	Thermalright Silver Arrow
Memory	Gskill Ripjaws 1600Mhz 8GB *4 = 32GB
Storage	Samsung pro 840 256GB, Segate 3TB and 1TB
Display(s)	LG 23" Full HD LED
Case	Antec LanBoy Air
Power Supply	Cooler Master M2 Silent Pro 850 Watts
Software	Windows 7 ulimate 64bit

System Name	Custom Built
Processor	AMD Ryzen 5 3600
Motherboard	Asus PRIME A520M-A
Cooling	Stock heatsink/fan
Memory	16GB 2x8GB Corsair Vengeance LPX 2400MHz
Video Card(s)	MSI 1050Ti 4GB
Storage	KINGSTON SNVS250G 256GB M.2 + 2 data disks
Display(s)	Dell S2421NX
Case	Aerocool CS103
Audio Device(s)	Realtek
Power Supply	Seasonic M12II-520 EVO
Mouse	Logitech MX Master 2S
Keyboard	Logitech
Software	Windows 11 Pro 64-bit