Questions tagged [led]

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What does this undocumented solid red LED (Intel 2.5G LAN) on the RJ45 connection mean?

On a Gigabyte Aorus X570S PRO AX board the RJ45 LAN Port is documented with Here's what I observe. Note the red speed LED. Both are solid on, the amber Activity LED flickers only momentarily since ...
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PC freeze randomly when playing games

Since last Monday, my friend's computer experience random freezes when he is playing + streaming using OBS. When it happens, he still have the sound, but the image is frozen, the live is going off and ...
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Controll Laptop LEDs

My laptop (HP Probook 11 G5 EE) has a LED on the back of the lid, which can be controlled under Windows with the program HP Interactive Light. Unfortunately, this is not available for Linux. As a ...
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My laptop doesn't boot after keyboard became unresponsive and the system rebooted

Today, I was using my laptop, and I noticed that the keyboard wasn't working, so i rebooted, and the keyboard was still not working, but after a few seconds, it started to typing random keys, and ...
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White dots / blemish in LED monitor repairable?

This 10-year old LED monitor has white dots / blemishes on its screen. Is this still repairable or does the panel needs replacement? More pics:
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Check LED light color & accuracy using Colormunki display probe

Ok, i have a XRite Colormunki display probe which i use to calibrate my screens using dispcal / Argyll. For a DIY film scanner project I'd like to check several neopixel led matrices I am ...
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1 vote
1 answer
39 views

How to disable keyboard button toggle light

I have an HP Envy 14, which features several smart function keys to mute sound / mute the microfone / disable the camera. When the function is toggled on, this is indicated by the little LED beneath ...
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2 answers
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How to control Computer RGB LEDs in Linux

[I asked this on stackoverflow first] Since I switched to a new AMD Ryzen system my computer lit-up. All new hardware components seem nowadays to have such fancy(?) RGB-LEDs built in (even in memory ...
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Do keyboards have a selftest result indicated by LEDs?

After yesterday's Windows 10 update and reboot, BIOS hung before booting. As it turned out it's something with the keyboard. Still I'm unsure whether it's the keyboard (only 30 years old ;-)) or the ...
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783 views

Why are my Keyboard LEDs blinking when shut down?

Recently my keyboard LEDs started blinking when my PC is shut down (see video here, sorry for the quality). Only when the PC is shut down, as soon as I boot they stop blinking. I think it started ...
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2 answers
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Does a graphic card needed in led 32 inches normal TV using as monitor

I wanna change my lg 32 inches led TV into a monitor so this screen is much larger than normal monitor so plz suggest me if I have to add some graphics card into this or their is no need to add ...
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Can RGB Fans work without them being lighted up?

i did a small research and still don't if RGB fans can work without the being lighted up. the real question is: Can i connect only the SATA POWER of the RGB controller? without connecting the MB? And,...
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1 answer
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Dell Latitude 5501 front LED flashing white-amber

I have a Dell Latitude 5501 and since today the front LED started flashing white-amber (1,1). When checking the docs, I find this site from Dell, but the pattern 1,1 is not described. Connecting or ...
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3 votes
1 answer
1k views

Changing thinkpad microphone mute LED behaviour

I was wondering and looking if someone has been able to make the following. Led indicator ON = Microphone ON // Led indicator OFF = Microphone OFF I think is the way it should work, not the default ...
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-2 votes
2 answers
2k views

Flashlight/Bright Light Damaging LED/LCD screen?

It is known that direct sunlight on a LED or LCD screen can cause damage. Would a flashlight of 110 lumen shining directly on a LCD or LED screen cause damage to the screen? Would that same 110 ...
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How to make the LED lights in my PC box in my Lenovo Ideacentre Y720 Cube desktop turn off?

I want them off all the time even after restart, there's Lenovo Nerve Center but it turns them off only until a restart (the last time I checked)...
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PC won't turn on and the NIC LED flickers for 50 seconds?

So i have had this issue for a while now(mostly after the last cleanup perhaps), but previously it did turn on after just sitting behind the power cord for 5 minutes or so, but now it won't even turn ...
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Connecting RGB LED strip to pc controller

I just bought a computer case Sharkoon pure steel rgb. It comes with 4 rgb fans that connects to a controller according to the following image: After connecting these 4 fans I still have 4 more empty ...
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Is "Dot Pitch" the distance between like-colored LEDs?

My understanding is that LEDs provide backlight in LED displays, while dot pitch is the distance between subpixels on the screen——these two are completely different concepts. But according to New ...
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Accessing the Debug LEDs on Dell OptiPlexes

Dell OptiPlex machines have debug LEDs on the front panel that say 1-2-3-4.  How can they be accessed from Linux/Ubuntu?  Perhaps via ACPI commands?
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1 vote
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Strange issue with Dell PowerEdge R610 hard drive status lights

I setup a test FreeNAS server the other day on a spare Dell PowerEdge r610 and noticed that the hard drive activity LEDs are always both lit no matter what the server is doing. I have 6 1TB 7.2k SAS ...
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Is it safe leaving monitors turned on (stand by) or could it harm the devices

I was wondering if I could leave my monitors turned on after I’ve turned off my pc, here are some other questions I had: Does the yellow status LED always suggest the monitor is in standby mode? ...
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3 answers
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What do CR_DET#_LED and HD_LED mean?

I was looking at a AMPKB-CT (Azure) motherboard. There were two LEDs: CR_DET#_LED, and HD_LED. I am guessing the HD_LED is for the hard drive. It was off, but I could hear the hard drive spinning. ...
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2 votes
1 answer
64 views

My HP PageWide Pro Printer's ethernet port is constantly flashing

The ethernet port LED (green) of my HP PageWide Pro Printer is constantly flashing in a very high frequency. Permanent, it seems to be 24 hours x 365 days even though the printer is not in use most of ...
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1 answer
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HP mute button LED not working

All of a sudden my mute LED stopped working. It was working fine for a while, but then out of the blue, it just stopped. At the same time, I also had an audio driver issue. So, I reinstalled the ...
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Is it okay if the Power LED to flash once while switching on UPS?

My CPUs front panel power LED is flashing once after I powered on the UPS. A 'TUCK' sound is also coming from my speakers. Is that normal or is there any issue with my motherboard?
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1 vote
1 answer
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HP Elitebook Caps Lock blinks erratically, (17, 16, 12 times etc), screen never comes on (8770W)

Who has detailed repair information? I had to replace the motherboard after the old one failed to turn on completely. I've learned that the separate laptop components are all required (modem, ...
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1 answer
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PC works fine, motherboard LED blinks when it's off

I had left my desktop PC with an ASUS motherboard plugged in at night (I generally unplug it when I'm not using it) and I noticed it's motherboard LED was blinking. I unplugged it, waited 10 seconds ...
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2 answers
644 views

How to turn off or disable the middle (scroll) button's light on my mouse?

I just bought a new Canyon optical mouse, but the middle button (scroll button) has a blue light. It distracts me. Is there a way to turn it off or disable it?
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-2 votes
1 answer
271 views

Generic RGB LEDs with Asus AURA compatible motherboard

Will this LEDs stripes work with a Asus motherboard AURA WS2812B 5050 RGB LED Strip 30/60/144 LEDs/M ws2812 IC Individual Addressable 5V [link ebay] My mobo: ROG-STRIX-Z370
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What RGB Led to use to light PC

I recently build my first pc. I have no RGB lighting in it, didn't want it at the time to look like a circus. But I do have some components that light up. I want to light up the whole a bit more ...
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New mainboard faulty?

There is an issue with a new ASRock Z370 Extreme4 mainboard. It does not seem to switch on. Both the 24pin and 8pin (CPU) power cables are plugged in. The LEDs on the (Corsair 100R) case are not ...
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-1 votes
1 answer
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Is it possible to program LED strip? [closed]

I bought a LED strip that uses molex connector to work. Is it possible to somehow control the strip from my computer and program it in some way to make it blink, fade etc. Here are few pictures of ...
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11 votes
1 answer
4k views

Does raising LCD monitor contrast increase energy usage?

I've got a Dell S23340M - an LCD monitor with an LED backlight, which has built-in options to adjust the brightness & contrast. The monitor features a nifty "Energy Usage" bar that changes as you ...
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1 answer
77 views

How do I correctly wire up a 2-pin panel LED to a 3 prong pinout?

I've just finished building a system around the Asrock E3C236D2I C236 board and am having issues with the hard drive indicator LED and surprisingly all the other LEDs work fine. The pinout for the HDD ...
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5 votes
2 answers
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Is there a way to use Caps/Numlock led for HD activities? [duplicate]

My laptop has not a hd activity led indicator. So, how could I use some other led (such as my keyboard NumLock or Capslock one) to blink when hd has some activity? Thanks in advance! OS: Linux ...
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lenovo ideapad s510g laptop screen display not able to see anything

I have a Lenovo Laptop S510g, the issue is a black screen. if I connect to TV by using HDMI Cable I can see that monitor is displayed correctly, and also I tried turning on torch so I can see the ...
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How does display (LCD/LED) connects to system bus?

The problem arose for me when I realized that the Laptops/PCs use two GPUs (one of them is an On-Chip low-performance and the other is an external high-performance GPU), and switch between these two ...
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How can I make a PSU power a lightbulb? [closed]

I'm making a steampunk PC chassis and I'd like to have the PC be able to light up lights like these Edison Vintage Bulbs: Is there a way to hook lights or anything else like that to a PSU or the LED ...
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1 vote
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MacBook Pro + Acer H236HL + electric standing desk

I have two external Acer H236HL displays connected to an mid 2015 MacBook Pro Retina all perched on a standing desk. The standing desk is a new addition. What I am finding is that when I raise or ...
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How can I completely disable the on-board LEDs on my ASUS motherboard?

I have an ASUS Z170 Pro Gaming motherboard. When I bought it, I did not realize it annoying always-on red LEDs: Now, these can be turned off using the BIOS, but - that doesn't "stick". They tend to ...
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3 answers
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Will 0.5 volts overvoltage damage a LED monitor?

I have a brand new LG LED monitor but for reasons which I won't detail here, I would like to run it with 19.5 volts instead of the 19 volts it is rated for (it came with a power supply of 19 volts). ...
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2 votes
1 answer
7k views

How can I disable the LEDs on my Gammaxx 400 CPU cooler?

I've bought and installed a Gammaxx 400 CPU cooler: It works well enough, but there's a problem - on its four corners are annoying shocking-blue LEDs. I want to turn them off! Yet - there doesn't ...
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1 answer
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What is an OH LED?

My SuperMicro case has an led labeled OH LED. It's in the bundle of wires with the other LED lights and switches. What does that stand for and go to?
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1 vote
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Samsung LED monitor SyncMaster SA300 horizontal dark lines

When I started a video game, suddenly all over the screen appeared a lot of horizontal, dark lines. At first I thought it was graphic card problem, but I've changed monitor and everything looked fine. ...
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2 votes
3 answers
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Does disabling laptop keyboard backlight LEDs improve battery life?

On a laptop, if you press the key that turns on/off the backlight on the keyboard, does it improve battery life? I ask this because I find myself instinctively disabling the LEDs when I don't need ...
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Debug LED code off, no speaker sound

Any idea, why my new mainboard is not showing the post code / does not beep at all after start ? The cpu cooler is spinning. Only the audio light is on. I attached the 2 connectors power and cpu. The ...
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-3 votes
1 answer
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Why don't a normal computer have a CPU LED? [closed]

So most desktop/laptop/server computers have a HDD indicator LED, but do not have a CPU LED, why is this? I asked a long time ago on another forum, but only a few people answered and they said "it's ...
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PC Power LED stopped blinking when in sleep mode

pc power led stopped blinking when in sleep mode. when pc is in normal mode, there is no problem. Can you help me why this is happening and hos can i fix this? Thanks.
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1 vote
0 answers
446 views

Computer freezes and CPU LED hangs

My CPU led hangs(stop blinking and constant led ) and also hangs display. It shows display problem sometime monitor shows out of range signal . I have format windows(windows 7(32 bit)) number of times,...
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