Red LED on motherboard illuminated yesterday?

Lately when I plug my Mac Pro in to power, it will automatically come on, even though it was fully shut down prior to removing power, I don't think it is supposed to automatically come on either way, and yesterday when this happened, there was a bright red LED light emitting from the bottom right of the motherboard that I've never seen before.
The machine booted into Windows and then I shut it down and unplugged, replugged it back in and the red light went away. Does anybody know what the red light means?
SH

Hi Spyhunter;
Generally, the red led light indicates a problem with POST, power on self test. With your system powering up on plug in, if it were mine I would take it back to Apple and have them check it out.
Allan

Similar Messages

2008 Mac Pro-Red LED on motherboard = ?? (not diagnostic LEDs)

My 2008 Mac Pro looks like it's on it's way out to pasture. (Again.)
So, last year I put a new PSU into my 2008 Mac Pro. Worked great and kicked it right back into gear. Temporarily. Now it's behaving almost the same—erratically. It won't boot. It may chime, may not, but either way it's going to "click" and turn off within 4-5 seconds of pushing the power button. THEN, re-pushing the power button makes it behave like it's fully dead—like it's not even plugged in. This is exactly how it behaved when the PSU died before.
But, HERE's the question... that no one seems to be able to answer: There is a red LED on the motherboard. It is NOT the set of diagnostic LEDs behind the RAM cage. This little light is almost under HD Bay #1, to the left of the BT card spot and the airport card. This LED stays lit red at all times now.
What does this red light mean?
Here's a thread that proposes that it is related to electric malfunctions. But there was never a confirmation of exactly what this specific light signifies.
If you can't picture where this light is, there are pictures in the above, linked, MacRumors forum thread.
Any input would be appreciated. These lights are mentioned nowhere in the service manuals that I've seen. Last time I was able to run the Apple Hardware Test, it said, "no problems found". Memtest says all is well. Reseating the cards does not remedy the issue. What is this mystery light telling me?

Here's a picture of the led in question.

For Red LED's What does it mean

I don't have my manual and every once in a great while when I trun this beast on my puter locks no video no sounds I mean beeps but just for red LED's
My mobo is kt266 pro 2
tbird 1700+
kingston 512 CL 2.5

Here what manual says :
"Processor might be damaged or not installed properly or damage/Discharge Lithium Battery"
The battery, it refers too, is on the motherboard and keeps the adjustments on the Bios when you turn off the computer. Since the motherboard is new I don't think that it could be damaged or discharged. Check your cpu (processor). Ensure that it is properly cooled and that it didn't crack during the cooler installation.
You can download the manual from this site for more information.There are manuals for all models.

K8N NEO Platinum 4 Red LED at Startup

I installed a new MSI K8N Neo Platinum mainboard in my computer in December 2005, and my computer has been a pain ever since. My problem is 85% of the time when I turn the power on it just won't boot up, I get 4 Red LED lights. If I shut it off and on half a dozen to 20 times. During one of those times it will bootup normal and work great. Shutdowns are normal.
My Family hates this and won't use it. This computer has been nicknamed the MSI Little Witch. I have had it down to barebones out of case with just graphic card, 1 memory stick, IDE harddrive, keyboard and mouse, it will do same thing. I've unplugged and replugged everything countless times. It still does it. I have tried Maxtor, Samsung, and Western Digital hard drives with fresh install of Windows XP Pro, it still does same thing. I have alternated memory sticks, same thing. It will warm reboot as long as I don't powerdown, but if I shut the power off it will not reboot until it cools down about 20 minutes. Then I can go through the same startup problems as I normally have. I have not done any overclocking.
Anyone have a fix to this fustrating problem?

I have the same problem with my K8N Neo Platinum. Except mine seems to occur after the motherboard has not had power after sometime. For example, it happened every time I moved my computer when I moved into and out of my dorm room. I don't know if its the same "cooling down" time you're talking about, but what usually fixes it for me (at least temporarily) is killing the power to the machine while it is on. Regular soft resets won't work for many tries, but when the computer is on with all 4 red LEDs i'll flip the power switch on the power supply. That usually makes it work fine. Also another thing that seemed to intermittently trigger it is changes to the BIOS. A CMOS reset would not fix that either. I would have to flip the power switch and kill the power. Then after starting it
up again it would be okay. I have also tried multiple combinations of different cpus, memory sticks, and video cards. I also made sure there were no shorts to ground anywhere.
Also after a year of solid operation (with the exception of this problem) I started to get Machine Check Exception BSODs in XP. I think this was because of a possible bad stick of RAM, because that seemed to cause lockups in the way beginning of the Windows setup (where it is loading files such as Windows Executive, etc). When I removed it and put another stick in, the windows installation would go fine. But, that did not fix the issue with this motherboard.
I've had so many problems with the multiple K8N Neo Platinums I have purchased. This is absolutely ridiculous I'm extremely POed at MSI for the widespread K8N series problems. I am usually very tolerant to companies when they have problems with products because I understand that problems and glitches can easily occur in mass production and design. It is virtually impossible to make a "perfect" product from the start. But the lack of response and concern from MSI about this is ridiculous. MSI did make an excellent motherboard here--if you can get a working one.

4 red LEDs on D-Bracket

I have a MSI K6 Delta board with AMD Athlon XP 2500 CPU and MSI Nvidia GeForce FX 5200 graphics.
When i first built the system all i got was fans and lights, no signal to monitor, and the D-Bracket reported 4 red LEDs. I then reset the CMOS jumper and all worked fine for about 8 hours. At that point it just froze (no cursor movement, no keyboard and the num and caps lock lights wouldn't change)
I hard reset the system and it is now doing the original problem of not booting with 4 red LEDs. I have tried resetting the CMOS jumper again, but it makes no difference.
The processor in this system worked fine in the motherboard it used to be in (several hours before moving into this board).
All power lines are connected (20pin and 4 pin) and i have tried removing all unessessary components like HDDs, CDs etc...
I think it is also worth noting that the PSU is a Q-Tec 350W. I am almost sure that this is the problem, do you agree?

I recommend this one.
http://www.aria.co.uk/ProductInfoComm.asp?ID=9628
http://www.aria.co.uk/productsList.asp?Category=96&Submit=submit
I had this one for my kt6 delta and my bro has this for his
Abit NF7-s v2 NF2 ultra
fx5700 ultra
xp2400
Its very cheap and very silent.
Don't be put off if you don't have a clear side window, it can be used in any case

Cpu or mobo broken? (four red leds and CD ticking on 865PE)

Hi folks, hope you can help me out.
My 2.5 year old system died today while using it. It's an 865PE Neo2 with a 2.8GHz P4 and 2x512MB RAM.
It doesn't POST and the D-bracket is showing four (all) red LEDs. What is also interesting is that there is some kind of activity on the CD/DVD drive (is ticking continuosly) and the keyboard Num Lock / Caps Lock / Scroll Lock LEDs blink at irregular intervals (all at the same time).
Does this indicate if it is the CPU or motherboard that is broken?
[I have disconnected all accessories + reseated the two power connectors, the memory sticks and CPU but no improvement.]
Cheers
Mike

I bought the computer "ready-made" by a computer manufacturer so I haven't been involved in the choice of PSU, but I expect the specs to be sufficient as they built lots of systems of this model. The computer is a "low noise" model (PSU labelled "w/noise killer") so this has probably affected their choice.
Anyway, the specs are:
DC out: 350W
3.3V+5V: 220W max
3.3V: 28A
5V: 30A
-5V: 0.3A
5V SB: 2A
12V: 16A
-12V: 0.8A
I thought my measured voltages looked fine, but was there something that caught your attention and indicated problems with the PSU? (Or maybe rather the failure statistics you mentioned earlier?)
Thanks
Mike

Wont turn on /blinking red led

Hi all, have my xperia z3 for about two weeks, not rooted, not unlocked, without any modifications. Yesterday before sleep it was with more than a half of akku, today as im woke up and got it in my hands it was off, im plugged charging cable, was thinking maybe the battery was drained, but nothing happens still, its just blinking red (led).
Was trying to hold power + volume up, nothing.
Reset key near sim dont works for me either - i'm just notice 3x vibrations and thats it, its just repeat vibrate 3x times again and again but nothing happens, no boot.
Solved!
Go to Solution.

You may need to perform a software repair using PC companion.The process will erase all internal memory.You might need to charge your device for about 1-2 hours before so the device has at least 60% battery.
Make sure the device is not connected to computer or laptop and turned off (sometimes you have to press power button and volume up until the device vibrates 3 times or on some devices you have to press the small button near the SIM tray or on the back of the device).
Open PC companion->support zone->phone/tablet software update->repair my phone/tablet blue highlighted.Follow the steps given,do not connect your phone until prompted to press volume down while plugging USB cable. If PC companion does not start the repair process, you might need to run it in compatibility mode with Windows 7 (in some cases XP).
All we have to decide is what to do with the time that is given to us - J.R.R. Tolkien

P7N SLI Platinum - no post - red led on board

Hi
I'm curious if you know about what that little red led light near the battery means.
I have the motherboard for 2 y now, no problems (no oc, 7 fans on the case), but tonight I got a BSOD playing l4d , reset and then it won't boot.
The fans are spinning, all of them, psu included, no Hdd activity, the monitor is black, no signal at all. And that little red led near the battery that I don't remember seeing lit till now, and i see there's another one, blue that's also lit when power on.
Pressed the little reset bios button on the back ,changed the vga and rams with working ones from my other system....same thing.
config: Antec ninehundred-well ventilated , Seasonic 650W psu , q6600 (45C medium load) , Mushkin rams , 9600gt
Is it dead ?

Quote
And that little red led near the battery
That was there before. It indicates that a swtiched-on PSU is connected.
Quote
Is it dead ?
At this point it is impossible to tell.
Please test with one memory module only, unplug the PSU from A/C power and >>Clear CMOS<<.

MSI KT4AV 4 RED LEDs WON'T BOOT

Hi. I recently purchased a new MSI KT4AV motherboard, new AMD Athlon 1.33 Ghz CPU, and new PC2100/DDR266 DIMM RAM, and when I turn it on, all 4 LEDs on the diagnostic bracket light up RED (meaning processor failure). Does anyone know what could cause this?
My system specs:
MSI KT4AV motherboard
AMD Athlon 1.33 Ghz 200 FSB CPU
PC2100/DDR266 DIMM
420W PSU (+3.3/28A, +5/40A, +12/18A)
Hopefully that's enough to diagnose any problems because it won't output any video, just 4 red LEDs on the D-bracket.
Thanks.

Hello,
When I bought my second KT4AV, I was planning on using an Athlon T-Bird 1.4 I had laying around in it. It had the exact same problem as you are having, it just didn't work. I then tried a Palomino 1700+ I had in a another computer that I knew worked fine - it was (and still is) in a K7T266 Pro2-RU - and it didn't work either.
I was thinking the motherboard was bad but I bought an Applebred Duron 1600, and it worked perfectly! So it would seem that even though they are listed as compatible, the older Athlon T-Birds and Palominos simply will not work. My advice to you, buy an Applebred Duron, or better yet, an T-Bred XP 2000+.
Sorry if that wasn't what you wanted to hear!
-James

K7t266 pro v1.0 4 red leds

I just bought an 1800+ to put in my old k7t266pro but I get 4 red leds when I start it up. It powers up as soon as I hit the switch on the PSU. I tested the CPU in a friend's motherboard and it worked fine. The k7t266pro was in working condition before I put it away for a few months. I happen to have 2 of these boards and I get the 4 red LEDs on both of them. I also tried different PSU's and only have the board, cpu, ram , and video card connected. Any help would be appreciated.

If the first four letters of the OPN on the cpu is AXDA then the 1800+ is one with a Thoroughbred core, MSI says that the K7T266 Pro does not support it. It only supports the Palimino core.
That does not mean for certain that your cpu won't work. Sometimes unsupported cpus will work in motherboards that do not support them. Clear the cmos with the power cord unplugged from the power supply. Set the clear jumper back correctly and plug back in the ac. Then try to see if the motherboard will boot up. If it does, you might see the cpu showing as an unknown cpu on the boot page. Go into the bios and do all of the settings manually for the cpu. The cpu will still probably remain an unknown cpu but if it works, who cares?

PM8M-V no beep no boot Solid Red LED

I've had the PC I've been using for about 2.5 years, no problems.
Last week a lightning storm killed all the AGP/PCI functionality of my old motherboard. At first, I thought it killed my AGP video card because the internal video to the old motherboard worked fine. This is where I decided to buy an MSI PM8M-V from CompUSA.
Tried installing the board today. I literally just powered down the PC with the OLD Board in it and it all was working fine. The two motherboards seem to be similar in quality and both have internal sound and video.
With the new motherboard hooked up when I press Power the CPU fan comes on, and the LEDS on the front of the tower come on. The RED LED [Which I believe is the HDD LED, will have to double check] comes on and stays lit. After about 20 seconds or so the system powers down. I get no beeps or anything. I doubt any of the components are bad because they were all just working 1 hour ago.
Does this point to a specific problem? I don't think the CPU is overheated as I have thermal paste the Heatsink fits snug.
Suggestions?

Ok, an update.
I have an Antec PSU 300W that appears to be working well.
At the moment I have 1gig of unknown brand DDR memory
I have a P4 Prescott 3.0GHz [I don't recall any of the other details as this PC is several years old]
All hardware pulled from a perfectly working system with the exception of an AGP slot on the old motherboard.
The old motherboard has nearly the exact same features and appears to be of very comparable quality.
I hooked the old motherboard up with the processor, memory, and same PSU and it booted to the BIOS just fine.
This new MSI motherboard WILL NOT boot to the BIOS with the exact same equipment installed. I have double and triple checked.
Is there anything else I should do before contacting CompUSA for a return. I've seen some recommendations about jumping pins to clear the CMOS or something.

Black screen on boot /w four red LEDs on D-Bracket

Whenever I go switch the power off on my PSU and turn it back on, and after pressing the power button on the front of the computer it doesn't post it acts as if I kept pressing the reset button.
The D-braket shows 4 red leds (which means damaged/not installed processor).
But if I hold the power button to turn if off, then I turn it back on it works flawlessly!
Am I doing something wrong? I didn't have this problem before.
Specs are below....
BioHaz

I did a Google search and found this below...
This happens to be my exact same problem, it happens when you turn on the PSU switch then turn on the computer immediately after that. It seems like you just have to wait.
Is this a common problem?
Should I worry about this?
Quote
The old black screen on boot up with four red LEDs on the D-Bracket
is a fairly common problem.
So far I've only seen four fixes for the problem.
1. Defective motherboard (Although this is seldom the problem)
2. Power supply is defective, or you forgot to connect the four
wire auxiliary power connecter to the motherboard. The auxiliary power
connecter must be connected for this motherboard to work.
3. Your reset switch is stuck. Disconnect the reset switch from the
motherboard, then try to boot up.
4. This one is weird. It fixed my problem, however, based on the
troubleshooting you've done, I don't hold out hope it will fix yours.
For some strange reason, some MSI motherboards will not boot
if you've just plugged them in. Plug in the computer, make sure
the power strip and the switch on the power supply are all in the
"ON" position, then go grab a beer. After waiting a couple of minutes,
turn on the computer.
I know it sounds weird. But I have the same motherboard and CPU.
If I turn on the power strip and attempt to boot my computer immediately,
I get a black screen and four red LEDs. If I turn on the power strip and
wait a minute or two, the computer boots up every time and works
perfectly.
Hope this helps.
"Bratek" wrote in message
news:[email protected]...
Self-build K8T Neo/Athlon 64 - All went well and installed without
issue. Proceed to start for first time, POST Message of "Device not
installed, Bios not found" Not verbatim but basically that. Could not
get past that except to enter CMOS Setup, RAID setup etc. Attempted
Win-ME Start-up disk and got to a command prompt and attempted to
install Xp Pro, started but gave error of hard drive not found though
all SATA connections were solid. Decided must be related to the BIOS
not found issue. Downloaded latest BIOS for AMI for this board and
from command prompt typed A:\adsfI712.exe a6702vms.160 The screen
showed the Flash and then the Programming without a problem.
Restarted PC and Monitor was BLACK. Checked all conn's, replaced Video
card etc.
Next step, Copied Flash Util: adsfI712.exe and renamed BIOS of
amiboot.rom and restarted PC holding Ctrl-Home for at least 5 mins. No
success. Attempted Clear CMOS Jumper, replaced and Restarted with
Floppy Amiboot.rom again. No Success. noted D-Bracket with 4 Red LED's
on back. I know what that means but do not know if that was there all
along. Removed CPU Heatsink and verified power, connections and
reseated CPU and replaced Heatsink w/ no problems noted. Repeated Boot
steps with amiboot.rom but still black screen throughout. Please Help!
Thanks in advance.
AMD Athlon 64 3000+
MSI K8T NEO FIS2R
AMI Bios (attempted 1.4 and 1.6)
Legacy DDR 512MB PC3200 400mHz Single
Nvidia GeForce FX5200 (temporary)
Maxtor 160GB SATA 7200 8MB
Emprex DVD Dual 8x DVDRW
Raidmax PSU 420W
Windows XP Pro Eventually

No post! 4 Red LEDS on Dbracket! K8N Neo Platinum.

I put together a brand new computer back in August with the K8N Neo Platinum as my motherboard. Here's a list of my components.
Athlon64 3000+
1GB OCZ 3500 DDR
Sapphire 9800 Pro Radeon
160GB Seagate SATA drive
NEC DVD-RW
ComproPVR TV tuner
Vantec 400W PS
Anyway, the computer worked great until just after Hurricane Ivan came through. After our power came back on, the computer booted a couple of times, and then for no reason started giving me problems.
The computer would start up for about 3 to 5 seconds with 4 red LEDs appearing on the Dbracket. Then power would then shut off automatically. I have not changed any hardware or software. I do not believe it is PS related, as I have tried my current one in another computer without problems. Also, I doubt the processor is faulty. I can't think of a reason it would just stop working. Please let me know if you've experienced anything similar and if you know of a solution.

probably a powerspike during the hurricane killed or almost killed a part of the pc, and it completely died right after.
you could have a pc store test the mobo, cpu and sorts....

BlackBerry Z10 won't turn on and red led blinks 4 times

Hi all,
Yesterday my BlackBerry Z10 suddently turned off, I turned it on again and it worked fine for a few minutes (battery was around 90% full), then it turned off again and I couldn't turn it on anymore! The red led is blinking 4 times with a 3 seconds interval between each 4 blinks sequence. I tried to charge the battery, connect it to the computer, turn it on without the battery (with charger on), with no success. Sometimes, it shows the BlackBerry logo, or even the logo with the % loading, but then it turns off in the middle of the process, on random percentages.
Does anyone know what happened to the phone and how to solve this issue?
Thanks!
V

Mine keeps turning off... I called them and they told me to send the phone to Blackberry by mail to check what's wrong and that when the phone gets there, they do a complete evaluation and in 30 days they send the phone back... In other words, I have to buy another phone! Blackberry assistance is useless...

After falling red led for 3 seconds then dead

Hi,
after falling on the floor my blackberry 8800 will not start anymore..
When I insert battery or charger cable the red led lights up for 3 seconds then turns back off but the device is dead...it the anything I can do?
Iv found other topic's talking about red flashing light and firmware reload, is this the same thing?
Thanks for any help!

Hey mau_mau,
You can try to reload your operating system but most likely all your data will be lost.
You can try to see if the device will connect to the BlackBerry Desktop Manager to back up data, but there is no guarantee it will be able to do so.
You can consult article KB11320 for instructions on how to do the load.
If you need further technical assistance, you can contact your wireless service provider.
Thanks and have a great day!
-HMthePirate
Come follow your BlackBerry Technical Team on twitter! @BlackBerryHelp
Be sure to click Kudos! for those who have helped you.Click Solution? for posts that have solved your issue(s)!

Red LED on motherboard illuminated yesterday?

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