Very loud fan, blank screen, nothing more on power-up

I'm hoping for a miracle here... just bought the PB in december (4 months ago). ran fine last night, on battery. plugged it in, burned a CD, ejected it, no problem. shut the lid halfway. came back 30 min later. was still plugged in but had shut down completely. tried to turn it on but only the fan came on, VERY loud and foreceful, and nothing else. then the fan stops and the PB is dead. computer was not hot, though. left it off overnight, and now the same thing happens when I press the power: fan comes on VERY loud, lasts about 10 seconds, then everything goes dead.
I've done the PMU reset, nothing. tried starting with [CMD + o f] and didn't work either. I can bring it to a genius but there are no appointments left today and I need this thing to work! any ideas? thanks!

yes, I'd planned on that already but I'm an hour drive from a genius.
I've tried everything else as well. it's just dead as soon as I turn it on, except for the fan. none of the keys work (including all the key combinations that are used on startup). it's as if the PB thinks that it's too hot, so it runs its fan on startup and then just shuts down. open firmware, resetting PMU and NVRAM etc, running as firewire slave drive, start in safe mode, single user mode: none of these work. the only other sign of life (other than the fan) is that the caps lock key's light briefly flashed on powerup. that's it.
I was hoping this might be something someone else has seen. since I'm not getting the "?" icon (indicating missing OS) I'm thinking it might be hardware but NOT hard drive related.
thanks all!

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G4 not starting up, black screen, noisy fan, chimes OK then nothing, after a few mins very loud fan!

Anyone else had this? On start up chimes as normal but screen refuses to come on. Have swapped monitors and same happens on the newer one. G4 was making noises before last week with very loud fan cutting in from time to time. Got lots of work on that computer! Typical, not all backed up! Is it the logic board? How much does that cost to sort out?
Thanks for your help

Hello, it's going to be tough to find anybody to work on G4s these days, Apple doesn't.
Have you blown the dust out lately?
Does the Video card have a fan on it? Does the fan spin freely?
If worse comes to worse, you can pull the drives & get the info off of them with one of something like these...
http://eshop.macsales.com/item/NewerTech/U3NVSPATA/

Very loud fan upon starting imac. Does anyone know how to fix?

My iMac has a VERY LOUD fan that turns on during start up and does not stoop. I tried to shut down and start up again. I also tried to unplug the machine overnight. Still happening.
Anyone have a solution?

This is a part of the larger MacBook Pro connectivity issue. There are several related threads dealing with the MBP's networking problems. If your unit is suffering from this type of difficulty, good luck ... (or a long ethernet cable)
(PS Everybody please make noise on this one so apple comes up with a solution.)
< Edited by Host >

What is causing the very Loud Fan noise everytime I use the computer? What is causing the Heat as well? Please help

Please Help!
My computer has been making very LOUD fan noises. I know this cant be normal. How can I fix this issue?
This has been going on for a while now. As soon as I turn on the computer....the noise starts.

Go check out Activity Monitor on your Mac. It will show you which programs are running, and how heavy their use of your CPU is.
When mine does this, for some reason, I have a bunch of "Managed Clients" running at once. I use Act. Mon. to shut them down, and my Mac runs normally.

My iMac doesn't start. Get the apple on the screen, nothing more happens. Any clues?

Rebooted - get the apple on the screen - but nothing more happens. What to do?

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
To restart an unresponsive computer, press and hold the power button for a few seconds until the power shuts off, then release, wait a few more seconds, and press it again briefly.
Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If a desktop Mac hangs at a plain gray screen with a movable cursor, the keyboard may not be recognized. Press and hold the button on the side of an Apple wireless keyboard to make it discoverable. If need be, replace or recharge the batteries. If you're using a USB keyboard connected to a hub, connect it to a built-in port.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

Brand new U500 has a very loud fan

I received this brand new U500 (customized on Toshiba.com) about 10 days ago - everything works great (love the back-lit keyboard) - but the fan noise is a little louder than what I'm used to. I had a 6-yr old Dell XPS with a quieter fan than this brand new Toshiba machine. Basically if I'm standing 20-30 feet away from the laptop I can hear the fan, and one can wonder if this comes from a refrigerator or a vacuum cleaner working in the background.
Has anyone had a similar experience - is this fan noise something I should just learn to accept or do you think I should do something before the computer comes out of warranty? I really would hate to have to return a brand new computer, but at the same time I think fan issues only get more numerous when a computer gets older.
Just for info, the machine is Satellite U500-ST6322, CORE 2 DUO P7450 2.1GHZ, 4GB RAM, DVD Slot load.
Thanks a lot.

Hi and welcome to the  forums.
you wrote
I've read that if I installed OSX 10.4 then the fan would run quieter.
Is this the case?
No, that wouldn't make a difference. eMacs are famous for their very noisy fans.
Some say they were originally intended as turbine impellers for Boeing, but were rejected as too large. So Apple picked them up, and modified them for use in the eMac.
eMacs were made to be workhorses in classrooms and their robust design includes that heavy duty fan, which does impose itself quite loudly.
Some people have installed a means to introduce resistance to the fan circuit to lower the voltage and hence the fan speed, in an attempt to quieten it down.
Whilst this practice seems to work, personally I would be concerned about that causing overheating as during summer things can get very hot here, though perhaps would be less concerned if living in the UK.

Very loud fan sound, can't get video, system still running...help?

I can't seem to find an answer to this anywhere here or throughout google. Can't find a similar problem.
We have a G4 tower here at work that we run FileMaker server on. It pretty much just sits there and we all connect to it remotely and use the FileMaker on our own machines. It's usually not even touched unless Filemaker needs to be restarted or something along those lines. It shares a monitor with another system so its not usually even connected to a monitor.
Well - today there is a loud fan noise coming from it that we havent heard before. So we went to hook up the monitor and can't get any video. It was fine in the past week or so because we have been on it with the monitor.
FileMaker must still be running fine because we can still connect...for now...but we can't load up a screen to properly shut down, or run the backup or anything to safely turn the machine off. I am not sure which OS is currently installed because I can't get to that info.
Our guess is that the video card died, and that is the video card fan spinning...but if that were the case, would the software running still be fine like it is?
Any help would be greatly appreciated. Our tech guy can't make it out until tomorrow morning and we're afraid to have to wait that long...
Thanks in advance!

G4 tower covers a lot of G4s; it would help to have more specific model information. I think some of the later ones (not my DP800 QS) had software controlled fans. It's possible part of the operating system has crashed and the fan is automatically going into full speed to automatically prevent overheating. The rest of the OS may still be running and explaining why you can get to your files. I'm not sure about the video though. Perhaps somebody else has something more constructive but with that kind of thing I can't help but feel you'll just have to switch off the machine and restart it.
Message was edited by: Limnos

Hp Pavillion dv7 - very loud fan noise (cracking)

My HP Pavillion dv7 starts up with a veqry loud fan noise.
It is still under warranty (hp care) tii 23/12/2011
Is the fan broken or can i resolve the problem myself

Hi,
If the fan is making a lot more noise than usual and sounds as if it's cracking, this is very likely to be a mechanical issue. By far the best suggestion I can make is that you contact HP straight away and arrange to have this repaired while the notebook is still under warranty.
The telephone number to arrange this can be found on the relevant link below.
If you live in the US, contact HP Here.
If you are in another part of the world, start Here.
Regards,
DP-K
****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
****I don't work for HP****
Microsoft MVP - Windows Experience

Very loud fan after suspend mode

Hi,
i installed the current arch version on my sony vaio laptop.
when i close my laptop the machine goes into suspend mode. when i open the laptop, after 3 seconds or so the fan starts. Very very loud.
I had the same issue under ubuntu. after some googling i found some forum entries about a bug within the kernel.
the output of sensors shows me that everything has no critical temperature.
Has anyone same experience with noisy fan after suspend mode?
Thanks
Marko

It will or can happen but you can reduce it somewhat maybe using SmcFanControl (2.1.3.1 - wwww.macupdate.com ) to keep the fans above default by 200 rpm. And run Hardware Monitor to monitor temps as well. They may be running much warmer than they could/should/ought to.
1GB and your system was on starvation express! ouch. 4GB is more of a normal minimum even. 4 x 1GB is nice balanced setup. 2GB DIMMs might be warmer, run 70C perhaps. And they use about 15W each.

Mac Pro will not boot, constant loud fan noise and nothing else

hello,
earlier tonight,i put my mac pro on sleep, then later on, when i wanted to take it off sleep and use it, it made the loud fan noise, which it always does but goes away, but this time it the fan wount slow down and the loud noise stays and i dont see anything on the screen. im guessing the fan noise is the ATI x1900 card...
any help please..i just bought it 2 months ago...

Hi, here are the steps I would go through. I would unplug the Mac Pro completely from everything and look at the video card's fan intake to make sure it isn't plugged and just make sure everything "looks" correct. I would then plug the machine back into one monitor/keyboard/mouse (leave all the other peripherals disconnected. Once that is done push the power button. Does anything happen? If not then if you have another mac and an external hard drive, make a copy of the OS on the drive and see if you can get the Mac Pro to boot off that drive. If the video card doesn't work then it will not show anything when booting off an external drive. If the external boot does work then I would suspect that you have a bad hard drive (or it crashed). At that point I hope you have a back up of all your data and such.
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Message was edited by: jlseattle74

Very loud fan (or other part?) noise in MacBook Pro

Greetings! My fan (I assume) has recently started making a very loud, horrible noise that sounds like a piece of plastic stuck in the spokes of a bike. It's driving me crazy and making me a burden to be around me when I'm working...which is always. Please help! I'd greatly appreciate it.

Perform a SMC reset:
http://support.apple.com/kb/ht3964
If there is no change, open the MBP and examine it. Look for dirt an debris, and if found, clean it out. You will need a #00 Phillips driver.
If still no success it may be that the fan is faulty and should be replaced. Make an appointment at an Apple store genius bar for a free and definitive diagnosis. It is not an expensive repair.
Ciao.

Very Loud Fan -- How to make it stop?

I have a new MacBook Pro that I purchased in November, replaced in December. Recently, the fan has been running really loudly all the time.
In one of the other posts, someone spoke about smsFanControl, that I downloaded. The fan monitor tells me that the fan is running at about 6000rpm.
I've rebooted my computer, I performed an SMC reset, I ran the hardware test from the OSX install disk (came back with Error: 4 SNS/1/40000000: TGOH), ran the disk utility. I also installed the firmware update prior to these problems starting. Occasionally the fan slows down. More often than not though, it's been running excessively high. The temp gauge seems to be working fine too (when the fan's high/6000rpm: 35 deg C, when the fan's running normally/2000rpm: approx. 50 deg C). I'm also not running any processor intensive software (I used to render 3D environments on my old laptop, but not on this one).
I would send it in to Apple, unfortunately I'm studying in France this year, and Apple France doesn't allow you to send your computer in. You have to bring it to repair center (closest one is an hour drive away, and I don't have a car).
Does anybody have any solutions? I checked the other postings and there don't seem to be any solutions that I can benefit from.
Thank you!
Macbook Pro 2.33 Mac OS X (10.4.8)

> If this is an intermittent problem, does that mean that the sensor's loose?
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Very Loud Fan

the fan in my macbook is making a very loud noise and is very annoying what should i do?

Take it in to be serviced.

Old and new battery both ~2 hour life, recently very loud fan

1)
My macbook pro, which was purchased April 2006, had suddenly dropped its battery life from about ~4 hours to ~2 in January. I noticed this because I traveled back home by plane with a 4 hour battery life for winter, and within weeks the life had dropped to ~2.
I already reset the system (i.e., remove battery, hold down start for 5 seconds, etc) with no avail. This was with the old battery. The apple store tried the same thing, was stumped, and decided to just give me a new battery.
The older battery was the replacement for the 'dud' my macbook pro was originally given. This new battery should be perfectly fine, but the battery life is still ~2 hours. I tried the system reset with this battery--which didn't work. I have also reduced the battery life to just about zero then charged it again--which didn't work.
Could there possibly be something wrong with the hardware? What can I do to fix it, what is the best course of action to fix this one problem?
2)
Just a few days ago a fan in the top left corner has begun to behave strangely. It has become very loud and seemingly inconsistent even with low CPU usage. By inconsistent I mean it sounds as if it has become loose or it won't maintain a constant speed. The best description for the sound would be 'boiling water.' What could be the cause for this and how can I go about fixing this problem?
Any input is greatly appreciated!
MacBook Pro Mac OS X (10.4.8) Purchased April 2006

1)
Have you checked your battery's serial number against the MBP battery exchange program? I did this out of curiousity with mine and it turned that mine was one of the faulty ones! So Apple sent me a new one and I sent the duff one back. It was still fairly new at the time so it still held a good charge.
2)
I had the fan thing but mine was on the right hand side. Your BEST bet...(what I did) open up quicktime and RECORD the noise several times at different operating conditions and save the files.
send your machine to a service centre and ask for an email address to send the files to so the technician can hear what you hear. I recorded it behaving normally as well so they could hear the difference.
The 1st time mine went in it behaved itself for them so they had to give it back to me, that's when I recorded the noises! I emailed the files before I sent my MBP back again, they took one listen and said they'd order the fans, BEFORE I sent it in. They called me to say that the fans were in so in it went for the replacement.
Hope it helps - mine sounded like it was going to explode and rip apart the inside! I can email you the files if you like?
Ben

My EMAC G4 has a very loud fan.

I recently bought my first apple machine - a used emac -
running OSX 10.5.8
But the fan is LOUD - not noisy - I mean it's sounding like an air-conditioning unit on medium and makes listening to any music uncomfortable.
I've read that if I installed OSX 10.4 then the fan would run quieter.
Is this the case?
Thanks for any help from a new apple user.

Hi and welcome to the  forums.
you wrote
I've read that if I installed OSX 10.4 then the fan would run quieter.
Is this the case?
No, that wouldn't make a difference. eMacs are famous for their very noisy fans.
Some say they were originally intended as turbine impellers for Boeing, but were rejected as too large. So Apple picked them up, and modified them for use in the eMac.
eMacs were made to be workhorses in classrooms and their robust design includes that heavy duty fan, which does impose itself quite loudly.
Some people have installed a means to introduce resistance to the fan circuit to lower the voltage and hence the fan speed, in an attempt to quieten it down.
Whilst this practice seems to work, personally I would be concerned about that causing overheating as during summer things can get very hot here, though perhaps would be less concerned if living in the UK.

Very loud fan, blank screen, nothing more on power-up

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