Red light at startup?

I've been busy setting up a refurb MacPro for over a week, between work and other commitments. I'm also new to the MP and this morning on startup I noticed something new. Well, new to me at least. I'm using the CyberPower 1500 Pure Sine Wave UPS and when I left work Saturday I shut it off, as I have done occasionally in the past. Not sure if this might be a contributing factor in what happened when I started up this morning. I turned on the UPS and then the MacPro within a few seconds. As I did this I noticed a flash of disturbingly bright red light which seemed to be emitting from inside the case and just above the power switch. Since I first booted up the MP it has been performing flawlessly, but this morning it took forever to boot and once it did I had to shut it down with the power switch. Tried again and the same thing happened, except that the red light was no longer visible. The same procedure again and eventually it did start up, but very sluggish. After two more tries I was finally able to shut it down properly. I thought that perhaps the NVRAM had been comrpomised, but didn't want to persue that yet. Again another 'proper' shut down and reboot. Eventually the MP was again performing as expected, but I have no idea what might have caused this to happen. I then ran disc verification and that showed no problem. Permissions showed three Library files that were problematic, so I ran a repair. All seems well now, but I am concerned about what might have caused this. I have two questions.
1. What does the red light at startup indicate exactly? Obviously it can't be good, but at this point I'm at a loss.
2. Is it possible that I started the MP too quickly afetr turning on the CyberPower UPS?
Any replies would be much appreciated.

When you moved in January, how long was the Mac not connected to AC power? You could have a weak PRAM memory battery. Have you tried zapping PRAM? See Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
 Cheers, Tom

Similar Messages

Red light around startup button comes on

I'm almost afraid to ask this. I bought a used Quad about three months ago and it's been working just fine. Every since I got it a red light comes on behind the startup button for about 1 or 2 secs at startup and never any other time. Like I said, the computer works fine and I use it continually. Does this red light indicate some problem I may not be aware of, or some problem coming soon?

Thank you both. It is the #7 led that is flashing on startup. I also have a dual 1.8 Power Mac and it doesn't flash and that was why I was really concerned, but I see that these leds weren't featured until 2005 and my dual 1.8 is from 2003. Have a comfortable summer ahead.

No startup chime, red light, fans running loud...

yeah, I know that there are other threads with the same topic, but I just wanted to know how common this problem is?
How many people have experienced this?
What are the common disturbances?
What is going on?
Why is such an expensive, powerhouse computer become such a puny electronic product because of power issues?
I posted this in another thread but,
Here's my story:
I am having the same problem.
Now before you start taking advice to back up all your data, reformat your hard drive, and reinstall all the software; please take note of a few things:
first off, I'm ****** that this is happening to me. I spend $5000+ for a "reliable" Apple computer. Then it doesn't want to turn on because its not safe. Sorry if I drown this post with bitter sarcasm but I am coming to the end of the line with my patience.
I called Apple Care, read a bunch of posts (here and elsewhere), and yes I do know about the SMU Reset button (like that really does anything?).
My problem happened a few weeks ago and I thought nothing of it at first. There was a power outage for a quick second and it turned everything off. When I went to turn on my computer, there was no chime, the red light was on, and the fans were running and eventually began running very loud. After letting it run like that in hopes of the screen lighting up, I turned it off by holding the power button. By the way, there's nothing on the screen and the keyboard doesn't work (I use a wireless keyboard, but I plugged in the OG cord keyboard to push whatever series of buttons recommended by these "geniuses") Trust me, the computer doesn't make it to that part of the boot process, so stop with commandoption+PR or F12 to get the CD out. It doesn't work! What's up with this computer! It can handle all these intense calculations,etc. but a power surge is going to shut it down indefinitely.
So I left the computer came back the next day, turned it on and its fine. Cool, I'm happy. It's Working!! I go on a few weeks, then I go to turn it on this Monday, same problem. But actually a worse situation. I had a client come over and the computer wouldn't work. I looked like a idiot. Couldn't do anything cause my computer didn't want to turn on. I do music production/editing. I use my G5 for running ProTools LE. I have other programs but that is the main one I use. There's nothing wrong with it. It's optimized for use with the mac. So those people who are going to advise me to uninstall all my software and all that - I appreciate your concern but don't give advice when you don't know anything!
So I am getting frustrated. My client left a little disappointed, but what can you do? I tried to call AppleCare on Mon. but it was Memorial Day. So I waited for Tues.
Tues morning, my computer turns on like everything is fine.
I'm happy but cautious. I talk to AppleCare rep. He tells me that it is a common problem they have heard about with the G5's. Wherever blackouts, brownouts, spikes, sags, dips, and other electricity inconsistencies occur, the Power Mac G5 has a breaker in it which flips so it doesn't receive uneven power supply and damage internal components.
I like that feature. Good thinking Apple. Protecting my investment from bad electrical grids. But I don't like the fact my computer has a mind of its own where it decides when it wants to boot or when it wants to sit there and run its fans all loud.
I shut down Tues morn to go to work. I come back in the evening, it doesn't want to boot up. Instead of getting angry trying a bunch of times to turn on/turn off the computer, I leave my house all together and go and have a few drinks. I come home ,don't even look at my computer, and go to bed.
I wake up Wed. morning. Go to turn on my computer. Successful boot. It's running. Okay, I think, I'm going to get down to the problem. I read all the logs, not like I know every piece of info, but just to see what's happening. Everything looks fine. I decide to run the AppleCare CD Tech Tool. It says restart holding down C. I do that. When the gray Apple Logo comes up, all this writing about kernals comes up and it tells me to restart or shutdown. I shutdown and attempt to restart, same problem: no chime, red light on, and fans eventually spin loud. Now the CD is stuck in there. I'm going to take it to the Apple Store tomorrow to if these "geniuses" can figure it out.
(Just a side note: Apple calls them geniuses, but its hard for me to think some disconnected college kid with a bad haircut and questionable social skills knows what's up with the power supply issues of a computer; maybe I'm wrong, but you can run your diagnostics and look at the chart of what to do and all that BUT Apple needs to listen to the people)
I am going to get a UPS (uninteruptable power supply) with a clean sine wave output to curb the issue at my end. It's not my fault I live in a area that receives uneven power output. I live in Los Angeles. Summer is starting up and I think its going to be hot, so blackouts, power dips and sags are inevitable. I just don't understand why Apple hasn't considered this problem and fixed it with something:
A recall to change the power supply, Is it something on the logic board?, are they going to reimburse me for lost income (Ha, yeah right)
I really want to know how many people are having this problem?
From what I've heard, it is a common problem.
So I think we need a common solution.
If its so common, it must be the computer. We are all going to live in different areas where the power may vary. Not all of us have the consistent power flow of 1 Infinite Loop in Cupertino, CA. So if it is such a common problem, Apple needs to fix it.
I can't spend more than five grand on a super duper computer and have it wuss out on some power issues.
Its a loss of income and productivity to me.
I can't have that anymore.
Sometimes my computer turns on, sometimes it doesn't.
I bought my PowerMac G5 in April 2006, its been about a month and a half and I'm having these problems.
Thank you for your time.
If anyone else has been having this problem, I feel for you.
It was been very difficult for me not to curse in this post, but I have tried to extend the same respect to all that use these discussion boards to create dialogue, find help, and create solutions.
LETS FIX IT!
Peace,
Swami G
Power Mac G5 Mac OS X (10.4.6) Dual 2.3 Ghz / 4.5 GB RAM

Well, you can see my specs below. I have the same problems as you, just worse. I am also running (as I have my previous systems) on an APC Smart-UPS 2200, and it doesn't solve this problem.
I bought my machine last December. In early March (just 2 days before my 90 days of phone support were up), I woke the computer from sleep to check email; about 5 minutes later it just froze. I had to force it down, but it never even got to the startup chime.
Called Apple, bought Apple Care on the spot, spent about 45 minutes on the phone with two levels of support, and Apple couldn't really diagnose the problem. They decided to send out a replacement logic board, processor unit and power supply for on-site service (I don't have an Apple service center nearby).
Nearly two weeks later the technician arrived with the parts, installed all of them, and - nothing. The system still exhibited the same symptoms as before the repair. He spent around five hours here, most of it on the phone with Apple. They decided that the processor unit they shipped was defective, so they sent another processor unit.
Nearly another two weeks later, the re-replacement processor unit arrived with the tech. He installed it, and everything worked. This was around April 1.
Fast forward to last Wednesday. Arrived home from work, tried to wake the Mac. Nothing happened. Had to force the machine off. Never booted again. Called Apple and went through the motions again. They're sending another logic board, processor unit, and power supply.
I asked about having the machine replaced since this will be the third repair attempt, considering it took two visits and nearly a month to repair it the first time it died. Apple was unwilling to replace it but I was told that if I had another failure, a replacement would be in the cards.
I agree with you about needing reliability in a computer as expensive as a Power Mac. It is not acceptable to have this kind of failure, repeatedly, with this kind of system. If my Windows PC has a hardware failure, I can take care of it myself. A top-end power supply is ~$200, a quality system board is ~$200-$300 - all very doable, and in very little time, if the need arises. A Power Mac logic board is ~$1K, a cpu module is well over $1K, who knows how much that crappy power supply costs, etc. If you have Apple Care, you face the kinds of downtime I'm having to deal with. A month without use of your computer. I mean, if I buy a Dell workstation, or an HP workstation, and pay an extra $200-$300 for service and something fails, Unisys will be here the next day and it will be fixed. That's the standard business class service experience you get from those companies with a computer that costs $600, much less the $3000+ you dish out for a Quad Power Mac. Apple's response is unacceptable.
It's a good thing I have kept my Windoze machine around, cause it's really saved my butt the last 2-3 months; that also makes me really sad, because in the last 6-7 years of Power Mac ownership I've had zero problems with any of them. My dad has my previous machine, a Rev A Dual 2.0 G5, and it's rock solid.
I sure hope that the Intel based Power Mac replacement doesn't suffer from what ever seems to afflict the recent Power Macs. I would absolutely hate to abandon OSX, but I will not put up with this kind of quality failure (hardware & service) again.
Power Mac G5 Mac OS X (10.4.4) Quad 2.5 GHz, 4GB RAM, Disk0: 74GB WD Raptor

Blackberry Z10 (SLT100-2) won't startup, no blinking red light and isn't recognized by PC

I have been using blackberry z10 which i bought from UK 1.5 years ago which was working fine so far. now, all of a sudden, my handphone's battery drained within 30 min, than started giving 4 short red flashing light within short interval. one of my friend using same model, bought from malaysia, he told me to unplug the battery and connect the device to directly wall charger. After i did that, flashing lights are gone and giving once red light each and every time i connect wall charger with my handphone. now i interchange the baterry wid charged one. it showing no lights even if i push the starting button. I already updated the latest os and using sideloader application named(mobile 1 market).
i now live in malaysia and also i got no receipt for showing this handphone to any BB care centre.
I already watched all the post and tried doing this steps..
http://www.blackberryos.com/blackberry-10-os/37518-how-install-leaked-os-onto-your-blackberry-10-sma...
but my phone got no connection to wallcharger, pc cable even any fully charged battery.
can you guys please help me out!!!

Hi and Welcome to the Community!
Please try this sequence...note that, throughout the entire 4h15m process, your BB must remain directly connected to a known-good wall charger (not PC USB, not a cradle):
With the battery inside, connect your BB to the wall charger
Leave it alone for 2 hours, no matter what the LED or the display does
Remove the battery
Wait 15 minutes
Insert the battery
Wait another 2 hours, no matter what the LED or the display does
This has been known to "kick start" some BBs. If it fails, then redo it but increase the wait time in step 4 to 2 hours, and perhaps 4-5 hours.
It is also possible that your battery or BB has experienced a problem...to test, this sequence is needed:
Obtain an known good and already fully charged additional battery...use it in your BB and see what happens
Obtain access to a known good and identical BB...use your battery in it and see what happens
The results of this will indicate if it's your BB or your battery that has the problem. Note carefully please that "new" and "know good" are not necessarily the same things. While rare, a "new" battery certainly could be defective. Rather, the simplest (and least costly, btw) method to conduct this test is to find someone with an identical BB who has no issues...trade batteries and see what happens.
Good luck and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
Join our BBM Channels
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Internal speakers suddenly will not unmute. My headphones work, and there is a red light coming from the headphone jack

I put my volume on mute a few weeks ago, and I don't know if I have used it again since then or not, but now the volume will not unmute. There is a red light glowing out of the headphone jack. Sound through headphones works. I've tried updating and restarting my computer. Help?

No, not forceful - gentle.
A PRAM-reset might also help:
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Immediately press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.Continue holding the keys down until the computer restarts, and you hear the startup sound for the second time.
Try this a few times.
Stefan

After installing an update I am no longer able to hear sound out of my speakers. A red light comes on where the headphone jack is. I have already attempted to trip to switch with a wooden toothpick in the headphone jack but have not had luck.

after installing an update I am no longer able to hear sound out of my speakers. A red light comes on where the headphone jack is. I have already attempted to trip to switch with a wooden toothpick in the headphone jack but have not had luck.

Have you gone into system prefs nad made sure that the headphone port is set to audio out. And not audio in.
Also make sure that you are selecting built in speakers for your audio output.
If that does not fix it try doing a Pram reset.
Shut your mac down.
Press the startup button.
Hold down the following keys. Command Option P and R. Wait till you hear the chime 2 times. Then let go. See if that fixes it.

Internal speakers not shown in sound output, no audio jack red light

Hellooo!
So basically my internal speakers in my mid-2009 Macbook pro are not working. When i try and change the volume i am getting the greyed out speaker symbol. Strangely, when a pair of headphones are plugged into the audio port and set to 'audio input' the internal speakers show up in system prefs, and the sound start working! When the headphones are removed it reverts back to not working again. I'm not getting the red light in the audio port.
This must be a software problem as they physically work when headphones are plugged in and i can hear the chime on startup.
I have tried repairing disk permissions, resetting the PRAM/NVRAM, re-installing OSX and the whole toothpick in the audio port thing.
I dont really want to have to take it to apple but I dont have any options left. My mac is pretty old, so i dont feel it is worth spending loads of money on it should the motherboard need replacing or anything similarly costly.
Has anyone else had similar problems, or a solution?

One more suggestion.
    Applications > Utilities > Audio MIDI Setup
    Audio Devices window
    Side Bar
    Click the Built-in Output.
    Under Mute any of the boxes checked? If so, uncheck it.
Best.

Strange red light in back of the system.

Hello everyone,
I just received today my new-like condition G5 Quad today and I have a question regarding the red light in the back. Where I see the digital audio ports I noticed a red light on. Is this call for concern, or is this normal? Also, the startup chime is working through the internal speaker and not through my main speakers. Is there a work around for this?
Nadav

Is the red light coming out of the jack or is it inside of the machine? If inside the machine, this may be helpful: About the Power Mac G5 (Late 2005) diagnostic LEDs
I believe that the startup sound coming from the internal speaker is just the way it is.
Luck-
-DP

No sound on my mac book and a red light in the headphone jack

as in the title,
The sound controls dont work and I have a constant red light out of the earphone jack, with the earphones in all is okay but without ....silence

The red light is the digital in light, that is how it reads the headphone jack. The reason the sound doesn't work is because a switch to turn the speakers back on is stuck (note that if you boot the computer, you will hear the startup tone).
There are several ways to fix this...
Some have found that putting the headphone plug in and out several times (maybe twisting it a little) will work.
Others have used a toothpick to adjust the switch (I don't advise this because the toothpick may break).
Instead of a toothpick, many have used a paperclip (probably best to use an insulated one). I couldn't get this to work, but I would suggest straightening, folding in half, then twisting the paperclip and moving it around in the port.
You can also use a sewing pen/needle.
I have seen all of these methods online, but they didn't work for me. I took a que from this instrucable and cleaned my jack with a dry q-tip. I then cut off most of the end and turned it around inside the port. This worked, but after I put the headphones back in the same problem came up, I just did the same procedure again and it worked again (even after I plugged the headphones back in and took them out).
PS: I woud suggest putting some q-tips and possibly some scissors in your MacBook bag in case the problem arises on the move.

HT4059 what does the red light and 'not in store' mean

What does the red light in manage my books mean? And what does 'not in store mean'?

Hello Simon,
I believe you have two unrelated problems. The red light is only associated with the digital audio port and indicates the "mute" switch inside the jack that turns off the built-in speakers when phones are in use has jammed in the mute position. No way it should affect your ability to start the computer. That has to be something else.
Does your computer give the normal startup chime sounds when you turn it on?
If you are getting the normal startup chime and have a wired keyboard, boot while pressing the SHIFT key. Keep holding the SHIFT key until you get a desktop, then let go the key. At this point, do not try to do any work with the computer but rather see if it will restart normally (without holding any keys or key combos).

HP workstation z400 gives 6 beeps & red light after chaging bios setting

Maybe somebody here knows what to do:
After I changed the setting of the PCIe-slots to "compute", the z400 no longer starts at all and won't give me a chance to change this setting back to the way it was. I understand that the "compute" setting is reserved for special video cards like the Nvidia Tesla card and I also know by now that it is completely wrong for my needs.
When I now press the power button, I see the red light flasing along with the 6 beeps indicating a graphics error. I already tried to reset the cmos by taking the battery out, pushing the cmos button...but no luck.
The way I see it, the z400 no longer expects a regular graphics card in the PCIe slots and therefore signals that no card is installed (same error code without any graphics card installed).
So: does anyone know how I can change this back to normal? There must be a way!
I can't tell you how much I appreciate your help because I'm in the middle of a production and this workstation plays a crucial role.
Thanks!
Vinne
PS I don't think it matters, but the OS is Windows 7, 12GB RAM

Hi,
Please try to clear it:
To clear CMOS, follow these steps:
Temporarily set jumper CLRRTC1 to pins 1-2.
Wait 5-10 seconds and then return the jumper to pins 2-3.
When you startup the PC you will need to enter BIOS setup to reset any custom BIOS settings.
Where are the jumpers, please refer to the following site:
http://h20000.www2.hp.com/bizsupport/TechSupport/Home.jsp?lang=en&cc=us&prodTypeId=12454&prodSeriesI...
Good luck.
BH
**Click the KUDOS thumb up on the left to say 'Thanks'**
Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

No internal speakers | digital output only | red light from audio jack

I plugged in a stereo through analogue mini jack to the headphone socket of my mac book pro. When i unplugged the stereo, the internal speakers failed to work. There is now a red light coming from the jack as if a "digital output" is plugged into the socket. But no digital output has ever been plugged into the socket - and I have no control of mute or volume settings.
When I plug headphones in, they work fine and I have control of mute and volume settings. Once the headphones are removed I am automatically set back to "digital output" with no control over mute or volume, and no audio from m internal speakers.
I have tried changing the settings in system preferences/sound/settings/output ... but there is no option other than "digital output". I suppose I would like to select "internal speakers" but there is no option for this. And like I stated earlier, the jack is lit up red.
I've tried software updates, restarts, disk utilities (permissions and repairs including repairing with the startup disk), plugging and unplugging, but to no avail.
When I try to change the volume on the keyboard's volume controls I get the "no entry" sign under the volume bar and have no control (as if it were stuck on mute).
The only thing I can think of is that I forced a mini jack into the headphone socket too hard so I'm worried that I've damaged the hardware.
Could this have caused the problem? Or is this a software issue? Any help would be appreciated.
In short I have no sound from the internal speakers.

Same here. I don't remember doing anything out of the ordinary. I was working in Parallels on getting a AM station to stream via some web interface. Next time I went to play sound on the internal speakers, no go.
I've tried zapping the PRAM, toggling the headphone jack and the toothpick thing. Nothing seems to work.
I've also noticed that I get sound in my headphones in iTunes but not in Garageband (someone had suggested that starting up Garageband would reset things.
Any other ideas out there?
Is there a file that could get corrupted that I could switch out of my back up?

Macbook Pro - No Sound from internal speakers + No red light

Okay so I know this a very famous issue (I've seen over a hundred threads with people having the same problem) but the problem I'm having is something I haven't seen anywhere else. I recently tried to fix my headphone jack on my Macbook pro early 2008 model when it DID have a red light emanating from it but when I finally managed to turn it off with a little wiggle from my paperclip the sound still didn't turn back on. In my system prefs my sound output still displays "Digital Out" and no other option for internal speakers. I know my speakers are fine because I can hear the startup chime. Also, I had a broken piece from my headphones stuck inside the jack a few years back and I retrieved it in....let's just say, not the most professional way to do it (I completely destroyed my headphone jack while attempting to retrieve the broken piece and now the hole is too wide for any headphones), though afterwards the internal speakers still worked for a while, it was just the headphone jack that was messed up.
Basically what I'm trying to say is: is there a way to enable my internal speakers without using any hardware methods? Because I tried the paperclip fix and the red light did turn off, but still no audio + sound prefs still shows 'digital out'. I really don't care much for the headphones jack anymore because I'll just override it with some USB headphones.
Thanks in advance
Some Images:
'Only displays Digital Out'
'My jacked up headphone jack (no pun intended, although very relevant)'

I agree Nick - it is a concern especially on such a basic function (sound) - Linc is right, the issue is microswitch, sounds like a bad design or a huge batch of sub quality switches, checking the forums this issue is common on MBP's.
Judging by the date and lack of further activity I assume you managed to get yours fixed at the genius bar ?
I finally fixed mine myself but posting reply for others who have same issue as this - however buyer beware folks, try this at your own risk !!!
The fix won't be liked by Apple Support, the genius bar, or the repair shops but it worked for me after over 12 months of using headphones / external speakers - WHAT A PIA !
Method -
Held Macbookpro on it's side with screen open and headphone/ audio port facing toward ground.
Took WD40 can with straw dispenser and placed straw inside audio port - sprayed 3 or 4 one second burst of WD40 into port.
Held MBP that way for 30 seconds giving MBP a shake to drain WD40 out
(I performed this whole excercise outside where the WD40 could drain out without an issue ;-)
I then took an old set of headphones and re-inserted / removed them from the audio port approx 20 times in and out with music playing on the MBP - intially when inserted music will only come from headphones then eventually MBP internal speakers start working !
I've tried everything else including the cocktail stick and bent pin inserted inside the port to try and free micro switch - nothing worked it was stuck fast.
As stated, can't endorse this for anybody else - you do so at your own risk - just stating this is what I did to get mine working again !

Red Light Drama

Yes I know there are other post about the red light and the lack of internal speakers. However none of the fixes mentioned in any of the other post has worked for me. The red light in my headphone jack has remained on since I updated my software. The internal speakers are not recognized no matter how many times I plug and unplug my headphones. I thought I could live without the internal speakers especially because wearing headphones helps get rid of the whine, but today I unplugged my headphones and the computer gave me an error message saying that OS X has logged off and that I had to hold down the power button to restart. I was not doing anything else except looking at my email. I unplugged my headphones because I was not using them and BAM the computer froze. By the way the sound works on startup.

I also received the grey popup which said I needed to shut off my computer a while ago after having it wake from sleep.
Soon after, I discovered that I didn't get any sound from the internal speakers and soon after that, I discovered the red light.
I get sound when I plug in external speakers (and the volume shortcuts also start to work then), but the red light remains when I pull them out, and the internal speakers go silent.
Very annoying, I just called Apple Store today because my battery stopped working, and now this. My 90-days are up, so I guess I'll take it to the technicians at the service center who are going to check on my battery.

What does a red light near front camera signify?

My iPhone shows a tiny red light near its front camera, what does it mean when its on?

The red light is the digital in light, that is how it reads the headphone jack. The reason the sound doesn't work is because a switch to turn the speakers back on is stuck (note that if you boot the computer, you will hear the startup tone).
There are several ways to fix this...
Some have found that putting the headphone plug in and out several times (maybe twisting it a little) will work.
Others have used a toothpick to adjust the switch (I don't advise this because the toothpick may break).
Instead of a toothpick, many have used a paperclip (probably best to use an insulated one). I couldn't get this to work, but I would suggest straightening, folding in half, then twisting the paperclip and moving it around in the port.
You can also use a sewing pen/needle.
I have seen all of these methods online, but they didn't work for me. I took a que from this instrucable and cleaned my jack with a dry q-tip. I then cut off most of the end and turned it around inside the port. This worked, but after I put the headphones back in the same problem came up, I just did the same procedure again and it worked again (even after I plugged the headphones back in and took them out).
PS: I woud suggest putting some q-tips and possibly some scissors in your MacBook bag in case the problem arises on the move.

Red light at startup?

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