Suddenly no video, fans full blast?

I've had absolutely no problems with my MacPro until tonight; I heard it wake from sleep but my monitor didn't wake with it. Clicking/typing seemed to work as usual, I just couldn't see anything. I restarted, and my CPU fans started running full-blast and wouldn't stop. Still no monitor. I have an 8 month old top-notch video card (not sure of the model, since I can't use the machine). Does it sound like my video card died suddenly?

The fans are set to High by Hardware at Startup.
When the software is running properly and not crashed, it reads the temperatures from several sensors multiple times a second and sets the fans to an appropriate speed. If the software does not get around to it, the fans revert to high to avoid possible heat damage to the computer.
Fans running full blast is an indication that the software has crashed.
The caps-lock light on most Mac keyboards is under software control. No response to caps-lock = software not running properly.

Similar Messages

G5 Quad, fans @ full blast & random sleeping..

I'm using a PowerMac G5 Quad, 2.5ghz, running OS x 10.5.8 I have a problem with random sleeping,
(the Mac, not me LOL). Sometimes it will go for days, run all night, with no problems.
Then it suddenly goes to sleep. It's not overheating, I've cleaned it out regularly & have temp monitor running.
It has done it within minutes of starting up. After it goes to sleep it can be woken with a mouse click of keyboard stroke,
and 9/10 times everything is where it left off. It has crashed, but comes back OK.
I have read a lot of stuff about firmware updates, but not sure wether to proceed.
Another symptom is constantly noisy fans.
How can I tell which firmware is running on the machine now?
Can anybody advise a course of action?

mrchrishouse wrote:
OK I,ve found my boot ROM version, It's 5.2.7f1 which is higher than any mentioned in any updates.
I've zapped the P RAM and Reset the NV RAM...
Still have fans @full blast at all times.
What controls the fans? Is there somthing else I can re-load or reset?
There's always the SMU reset: http://support.apple.com/kb/HT1436
The fans are controlled via the SMU, which has a watchdog timer running which is reset when control comes from the CPU running the system piece that monitors the thermal state of the machine. That is why, when the system tanks, the fans will firewall as a safety measure.

Mac Mini G4 won't boot; fan full blast . . .

Hello!
I was using my G4 Mac Mini when it decided to re-boot itself, and on start-up, all I heard is 1 loud whrrring sound from the fan, a short pause, followed by continuous whrring sound from the fan going at full blast (very loud!). The screen shows nothing.
I've tried the troubleshooting steps in the Apple site but nothing seems to work. Each time I start it up, it does the same thing.
A few months back I'd the unit repair under warranty by Apple (replaced logic board). So it's quite frustrating to have it down again - and now it's out of warranty.
Any ideas?
Thanks.
Mac Mini G4 Mac OS X (10.4.8)
Mac Mini G4 Mac OS X (10.4.8)

It's perhaps telling that the problem occurred after the system forced a reboot. That tends to suggest there's a significant fault - likely hardware, since if the issue was with MacOS it would not be likely to cause the fan to ramp up to full speed on startup with the screen showing nothing.
You mention that you've tried troubleshooting steps, though not which ones. Likely, given that it features in G4 mini troubleshooting of startup issues, that would have included a PMU reset, but if you haven't yet tried that, do so. I would not hold out much hope that it will assist in this situation, but the power manager is the only hardware component that could cause this sort of potential issue, and the only one that can be reset by the user.
Assuming a PMU reset doesn't help at all, and since the system doesn't show any display, it's not worth trying to boot from the original install disk to run the hardware test since the system isn't even managing the power on self test, thus won't move on to loading MacOS. At that point, I'd say you should take the mini to an Apple store if you have one in your location, or to an Apple authorized service provider for them to give you an idea of what is wrong and what it would likely cost to repair it.
If you don't want to do that, the only option is to open the system and examine it yourself. The problem with that, however, is that there really aren't any user-servicable parts inside so other than checking that everything is correctly connected and properly seated, there's really not much else you can do.

System fans full blast

Hi there. I have a Power Mac G5, dual 2.7's, and I turn it on this morning and the system fans immediately kick on full blast, before the OS even loads. They won't slow down or kick off unitil I turn the computer off. I tried resetting the PRAM and SMU, ran the Apple Hardware Test, and it said everything was ok. This thing sounds like a vaccum cleaner, please help!

Yeah, count me in - dual 2.7.
New processor and still sleep problems, especially if left alone for long periods of time.
Here's what I have done so far (still in process):
1. Erase and install of OS X via disks included with computer for HDD installed in the lower “B” slot. The HDD installed in the “A” slot at this time had all of my software and 10.4.6 with all software updates installed. Install crashed at the end of second DVD and computer had to be shut down via the power button.
2. Removed primary HDD from the upper “A” slot and replaced it with the newly formatted (erase and install) drive that previously occupied the lower “B” slot.
3. Started computer, entered basic information and allowed wireless keyboard and mouse to pair. Did not set up AirPort at this time.
4. Attempted sleep with DVI connected only. Left machine sleep automatically for one hour, and then restarted successfully.
5. Plugged in USB 2.0 cable from Apple Cinema Display into main I/O in the back of the computer. Let machine sleep automatically for one hour, and then restarted successfully.
6. Plugged in FireWire cable from Apple Cinema Display into main I/O in the back of the computer. Let machine sleep automatically for one hour, and then restarted successfully.
7. Plugged in iSight cable and Mighty Mouse into Apple Cinema Display. Let machine sleep automatically for one hour, and then restarted successfully.
8. Plugged in FireWire 800 cable from external HDD (powered on) into main I/O in the back of the computer. Let machine sleep automatically for one hour, and then restarted successfully.
9. Plugged in USB 2.0 cable from iPod nano into main I/O in the back of the computer. Let machine sleep automatically for one hour, and then restarted successfully.
10. Plugged in FireWire cable attached to iPod photo and FireWire cable from CompactFlash card reader into FireWire PCI card. Let machine sleep automatically for one hour, and then restarted successfully.
11. Computer not making POST “gong” on restart. Reset PRAM successfully.
12. Shut down computer and reset SMU. Removed all RAM except innermost two slots.
13. Restarted computer and allowed it to sleep automatically for 45 minutes. Woke from sleep successfully.
14. Shut down and remove first pair of DIMMS and replace with next pair. Let computer sleep automatically and wake after 45 minutes.
And 4 more GB's of RAM to go....
This unit just had a new processor installed.
Since then, I have been on the phone with AppleCare for hours. Every tech blames everything except the computer. Good luck, all.

Fans full blast another case 21.5" model

At first, my new IMac was having an internal speaker problem, the apple technician came to replace the logic-board, since then the fan turns into full blow all the time. The noise is unbearable. The technician came to replace the logic-board again and then the third time, the power supply. Now it took more than 4 weeks and the issue there. The SMC reset has been tried as well.
I filed a complaint at Apple customer service and requested a new replacement since I bought it just December last year. I was told to wait and the response might not be positive. What can I do?

I wonder if some owner of the IMac 21.5" can run iStat on their machine and post their screenshot here, mine is http://picasaweb.google.com.hk/lh/photo/q3ueZkPeAnlIFlXj7c6M_A?feat=directlink
and I suspect that some temperature is missing.

Upgrade to 10.6.7 Fans full blast and Screen washed out

Update went well but after restart, the icons, finder windows, system preferences all look washed out. It is almost like they are 8 bit color not 24 bit color. At the same time the fans go crazy at login and then settle down later. Logged in with Safe Mode and it did not change anything. I reinstalled from Combo, still no joy. Any ideas?

Update: The fans seem to have settled down, maybe it was an update to Spotlight?
Screen still washed out. It looks like when you attach an external monitor and you do not have the cable fully set. In Finder, you don't see light gray lines, in Excel, you don't see the grid. You could also say that the resolution is not at "millions of colors" but at 256 or less.

Intel Mac Mini fans run full blast even when off

Hi All,
I have gone through the forums and haven't found an answer to this one. I have an Intel Mac Mini running the latest updated Tiger that I use solely for a media center.
About a week ago, the box started running fans full blast, regardless of whether it was actually turned on or not. As soon as it is plugged in the fans blast.
Otherwise, it seems healthy, and boots normally.
The steps I have taken so far include resetting permissions, verifying the disk, and resetting the SMC in the proscribed fashion.
After this occurred, I downloaded and installed smcFanControl from Lifehacker.com. This reported fan speed of zero and Temperature of zero.
Next I opened the case and insured the fan/HD cable next to the lttle battery was securely fastened as this had been reported to cause this symptom.
What's next? The device is out of warranty and honestly, I don't want to spend any money if I can help it.
Should I take it apart further and see if the other end of the fan/HD cable has somehow worked loose?
Can anyone think of another cause besides a loose cable?
What if I completely disabled the fan? The hardest thing I ever ask it to do is run iTunes and VLC.
Any advice is greatly appreciated.
Dave

I have refurbished two G5s with LCS and screaming fans (this was avery common problem with G5 LCS macs), the red light on the motherboard could mean the CPUs need to be re-seated. This red LED light appeared on my mac after I had removed the CPUs to add new thermal paste.
If you have done all the necessary basics with no sucess here are a few things to try next.
1 - Coolant
As BDAqua mentioned above, coolant evaporates and often leaks at the 'O' rings, to check this you will need to remove the CPUs from the LCS and check for crystalisation (white rice). If you have leakage, it will be time to drain the block, add new coolant and 'O' rings. This is tricky to do but there is lots of info here and on other sites to help you.
2 - Thermal paste
Replace the thermal paste with Artic MX4.
Try the above and let is know how ou get on.

My macbook pro is lagging, freezing, and fan runs at full blast. How can I fix it?

When I start up my 2010 Macbook Pro now, the fan starts running as soon as the spinning gear appears below the apple logo, the boot up is insanely slow, the mouse doesn't track well with my trackpad movements, and trying to open programs often leads to a non-responsive program with the pinwheel of death spinning for minutes at a time. I try to shut it down (takes approx. 20 min. now) and when the screen goes black, the fan continues full blast. After that I can boot up the computer and it runs normally, but the whole process takes about 50 minutes longer than it should, especially with a relatively new SSD (~ 8 months old). Has anyone seen anything like this before or does anyone know how to fix it?
It loads well enough in safe boot, and I've tried cutting out most of the apps that launch at startup with poor results. I've also tried resetting the SMC with equally poor results. I need help!
Here's my Etresoft report as well.
EtreCheck version: 1.9.15 (52)
Report generated August 27, 2014 at 10:51:10 AM MDT
Hardware Information: ?
MacBook Pro (13-inch, Mid 2010) (Verified)
MacBook Pro - model: MacBookPro7,1
1 2.4 GHz Intel Core 2 Duo CPU: 2 cores
4 GB RAM
Video Information: ?
NVIDIA GeForce 320M - VRAM: 256 MB
System Software: ?
OS X 10.9.4 (13E28) - Uptime: 0 days 0:15:23
Disk Information: ?
OCZ-AGILITY4 disk0 : (256.06 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted>: 209.7 MB
Untitled (disk0s2) / [Startup]: 255.07 GB (21.57 GB free)
Recovery HD (disk0s3) <not mounted>: 784.2 MB
HL-DT-ST DVDRW GS23N
USB Information: ?
Apple Inc. Built-in iSight
Apple Internal Memory Card Reader
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver
Apple Inc. Apple Internal Keyboard / Trackpad
Configuration files: ?
/etc/hosts - Count: 49
Gatekeeper: ?
Mac App Store and identified developers
Kernel Extensions: ?
[not loaded] com.Perfect.Driver.SystemAudioRecorder (1.0.0 - SDK 10.9) Support
[not loaded] com.squirrels.airparrot.framebuffer (3 - SDK 10.8) Support
[not loaded] com.squirrels.driver.AirParrotSpeakers (1.8 - SDK 10.8) Support
[not loaded] xxx.qnation.PeerGuardian (1.1.9) Support
Problem System Launch Daemons: ?
[failed] com.apple.ucupdate.plist
Launch Daemons: ?
[not loaded] com.adobe.fpsaud.plist Support
[not loaded] com.adobe.SwitchBoard.plist Support
[not loaded] com.bombich.ccc.plist Support
[not loaded] com.google.keystone.daemon.plist Support
[not loaded] com.microsoft.office.licensing.helper.plist Support
[not loaded] com.parallels.desktop.launchdaemon.plist Support
[not loaded] xxx.qnation.PeerGuardian.kextload.plist Support
Launch Agents: ?
[not loaded] com.adobe.AAM.Updater-1.0.plist Support
[not loaded] com.adobe.CS5ServiceManager.plist Support
[not loaded] com.citrix.AuthManager_Mac.plist Support
[not loaded] com.citrix.ReceiverHelper.plist Support
[not loaded] com.citrix.ServiceRecords.plist Support
[not loaded] com.divx.dms.agent.plist Support
[not loaded] com.divx.update.agent.plist Support
[not loaded] com.google.keystone.agent.plist Support
[not loaded] com.hp.messagecenter.launcher.plist Support
[not loaded] com.parallels.desktop.launch.plist Support
[not loaded] com.parallels.DesktopControlAgent.plist Support
[not loaded] com.parallels.vm.prl_pcproxy.plist Support
User Launch Agents: ?
[not loaded] com.divx.agent.postinstall.plist Support
[not loaded] com.spotify.webhelper.plist Support
User Login Items: ?
Battery Time Remaining
Dropbox
Google Drive
Internet Plug-ins: ?
DirectorShockwave: Version: 12.0.7r148 - SDK 10.6 Support
o1dbrowserplugin: Version: 5.4.2.18903 Support
Google Earth Web Plug-in: Version: 6.1 Support
Default Browser: Version: 537 - SDK 10.9
OfficeLiveBrowserPlugin: Version: 12.3.6 Support
OVSHelper: Version: 1.1 Support
Silverlight: Version: 5.1.30514.0 - SDK 10.6 Support
FlashPlayer-10.6: Version: 14.0.0.145 - SDK 10.6 Support
DivXBrowserPlugin: Version: 2.2 Support
Flash Player: Version: 14.0.0.145 - SDK 10.6 Outdated! Update
iPhotoPhotocast: Version: 7.0
CitrixICAClientPlugIn: Version: 11.8.2 - SDK 10.7 Support
googletalkbrowserplugin: Version: 5.4.2.18903 Support
AdobePDFViewer: Version: 10.0.1 Support
QuickTime Plugin: Version: 7.7.3
SharePointBrowserPlugin: Version: 14.4.3 - SDK 10.6 Support
JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Check version
Safari Extensions: ?
DivXHTML5
AdBlock-2
HoverZoom
Facebook Cleaner (Disabled)
1-ClickWeather
Facebook Improved
Audio Plug-ins: ?
BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
AirPlay: Version: 2.0 - SDK 10.9
AppleAVBAudio: Version: 203.2 - SDK 10.9
iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins: ?
Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
User Internet Plug-ins ?
Unity Web Player: Version: UnityPlayer version 2.6.1f3 Support
3rd Party Preference Panes: ?
Flash Player Support
Growl Support
Time Machine: ?
Skip System Files: NO
Auto backup: NO - Auto backup turned off
Time Machine not configured!
Top Processes by CPU: ?
      2% WindowServer
      1% ps
      0% SystemUIServer
      0% PluginProcess
      0% com.apple.WebKit.Networking
Top Processes by Memory: ?
213 MB Safari
152 MB com.apple.IconServicesAgent
78 MB Dock
66 MB PluginProcess
66 MB CalendarAgent
Virtual Memory Information: ?
318 MB Free RAM
1.64 GB Active RAM
1.38 GB Inactive RAM
421 MB Wired RAM
240 MB Page-ins
0 B Page-outs

Remove Growl, DiVXHTML and other DIVX software (use MPEG4Streamclip or Smartconverter or Wondershare Videoconverter for videos you need to convert for your own use, and not for giving to others unless you own the copyright for it). Update your Adobe Flash from http://www.adobe.com/
Shut down Parallels except when you need to use. Disable Citrix and your File Sharing for VPN or remote access for Citrix except for when you use remote access. Find out how to remove Peerguardian. The Mac has its own firewall which blocks all except ping attacks through Apple menu -> System Preferences -> File Sharing. Use a hardware router to block ping attacks. Parallels has its own built-in networking firewall for Parallels itself.
This tip may uncover other slowdowns: https://discussions.apple.com/docs/DOC-6921

Help: on start all fans switch on on full blast

Hi,
Looking for an advice on urgency. Opened G5, which otherwise functioned okay, for a bit of clean up. Removed, cleaned and placed back (in that order): the main fan assembly; speaker-fan; HD; the HD fan; video card; the rear fan assembly; RAM modules. With everything back in place (bar the aluminium body panel but with the latch closed) I switched on the PC and for about 10 - 15 sec everything was normal; then I heard fairly loud sounds like dial tone, and a few seconds later all fans switched on on full blast; also, the front white light began to flash. It was like air raid was imminent... Indeed I panicked and switched the machine off.
Any ideas what could possibly went wrong???
Thanks.

Thanks so much Japamac! Turned out I messed up the RAM modules order. Now is back to normal.

2.3 G5 Crashes and Fans Running Full Blast

My work horse G5 dual 2.3 crashed today and the fans were running full blast.
I did some research and have:
-run Disk Warrior
-reset the PRAM
-reset the SMU
-replaced the 3.6V battery with a $20 battery from Radio Shack.
The system still crashes, leaving the fans running a full speed. Then, I noticed that only 1 CPU is being recognized. :"(
Is there anything I can do to get the other CPU back up/ recognized or is it dead?
Is it feasible to buy a CPU off ebay to replace mine? If so, is it a straight forward operation or very tricky?
Thanks.

Thanks for the reply and link, japamac. That thread didn't pop up in my search.
After following your link, I ran the Apple Hardware Test. The detailed test took right at an hour and a half (three times longer than it said) and returned no problems.
I restarted and both CPUs showed up in the Activity Monitor and things were fine for about 20 minutes, then the system simply froze, while I was running Safari and Firefox. But, no loud fans this time.
Upon a hard restart and then a soft restart, I'm back to one CPU.
Since only one CPU is showing up, I don't have a faulty one to deselect (I installed the "Processor" System Preference from the Developer>Extras>PreferancePane) or disable via Terminal.
So, I've got a couple of questions:
1. Where are the error logs that I should look at?
I've opened the Console, but can find no mentions of "panic" or "cpu," other than some 3 year old references under "Java."
2. More importantly, *how do I know +which CPU+ has failed*?
I see no references to "CPU 1" or "B" or "0" or "A." It's as if I've suddenly got a Single 2.3 G5.
3. Any possibility that this is a software issue?
I'm wondering if a recent update of Safari could somehow be a culprit. I had it open and also had Firefox open, both with 10-12 tabs. I know they can be memory and processor hogs.
Anyway, I will reseat the CPUs and grab a serial number while in the process and report back after a while.
Thank you for your help.

Random Overheating/Fans Running Full Blast

Hi there,
Ever since I received my Early 2008 Mac Pro a couple of months ago, it would randomly begin blowing the fans at full blast and continue to do so no matter which OS I boot to, Mac OS X, Windows, or even Linux discs. iStat Pro reads that my Northbridge is running at 249º F, which is completely ridiculous, since all of the internal components to the machine are running very cool. This Northbridge sensor is appearing to throw the fans into overdrive. It sounds like I'm working next to a vacuum cleaner. It's very loud and irritating to work next to.
Unfortunately for me, I don't live near an Apple store, or have the means to get to one. Apple also will not let me send in my machine. About a month ago I had the chance to drop my machine off at an Apple store, but the geniuses were very confused about the problem. 2 Weeks later I received a phone call explaining that my problem was fixed. They never explained to me how the problem was fixed. I had a friend drive out to the Apple store and pick up my machine for me, but when I turned it back on, it still ran full blast. Nothing was different.
I came back from work one day and to my surprise the machine was completely silent. It has been randomly going from full blast fan speed to normal fan speed ever since, fixing itself every few days. I have 0% CPU usage at all times, yet the machine thinks it's overheating.
So now I ask you, Apple Discussions Board members, what can I do to resolve this annoyance? I have:
Reset PRAM
Reinstalled Mac OS X
Unplugged the computer for days on end
Swapped Hard Drives
Taken RAM out
Tried SMCFanControl
Taken out that little CR2032 battery on the mainboard
And no luck. Help is appreciated!

Yesterday I popped in my disc and did an Apple Hardware Test. It passed with flying colors after hanging up and appearing frozen for 10 minutes. Found that little button behind riser A and pushed it for 5 seconds, rebooted a few times, unfortunately it did not work.
Also where is the Apple Hardware Monitor? Are you sure you don't mean Activity monitor? I couldn't find where the temperature/fan readings are in Activity Monitor.
The fans turned off, however, today when my computer woke up from sleep mode. They were off for about ten minutes when all of a sudden the fans kicked on full blast. This was strange because the computer would usually gradually increase over a 15 second period... not immediately. So now it's still stuck here, making noise :\

My MacBook Air 13' (2013) will occasionally start the fan at full blast, not connect to any wifi or detect any wifi, and will remove the battery icon from my menu bad as well as tell me there is no battery connected. How do I fix this?

My MacBook Air 13' (2013) will occasionally start the fan at full blast, not connect to any wifi or detect any wifi, and will remove the battery icon from my menu bad as well as tell me there is no battery connected. How do I fix this? I have restarted my computer multiple times, **** it down, and ran a diagnostic test to tell me nothing is wrong and my computer is not running any applications. There is no reason for the fan to be on full blast! when I try to set the option to show my battery icon in the menu bar, it will automatically uncheck. How do I fix all of this?

Have you tried SMC and PRAM resets?
http://support.apple.com/kb/HT3964
http://support.apple.com/kb/ht1379
Ciao.

Fan noise like a hair dryer at full blast

Hi there,
I have had this IMac G5 (1.8G) since beginning of 2005, every time I go to a web site which has flash - my IMac fan goes on very loud noise like a hair dryer at full blast.
Does anyone know what the problem is? and how do i fix it?
Thank you for your help,

How much RAM do you have? Did you check the Apple extended warranty that I mentio0ned in the other thread?

Fan on full blast!

I was having problems with my mac freezing up & not opening apps, or any windows whatsoever, so I tried to restart it by pressing the button. Now, when my imac starts up the fan goes to full blast and it just gets stuck on the opening apple screen. Please help my baby! lol

Hi Macjaxi and welcome to the forums!
Sounds like it needs a bit of TLC and maintenance, as well as updating to 10.4.11!
Repairing permissions is an important part of regular maintenance, and should always be carried out both before and after any software installation or update.
Go to Disk Utility (this is in your Utilities Folder in your Application folder) and click on the icon of your hard disk (not the one with all the numbers).
In First Aid, click on Repair Permissions.
This only takes a minute or two.
Background information here:
http://docs.info.apple.com/article.html?artnum=25751
and here:
http://docs.info.apple.com/article.html?artnum=302672
If you were having any serious problems with your Mac you might as well complete the exercise by repairing your hard disk as well. You cannot do this from the same start-up disk. Reboot from your install disk (holding down the C key). Once it opens, select your language, and then go to Disk Utility from the Utilities menu. Select your hard disk as before and click Repair.
Once that is complete reboot again from your usual start-up disk.
More useful reading here:
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
http://support.apple.com/kb/TS1417

GeForce 8800 GT Fan running full blast

Hey there folks,
I have a Mac Pro (early 2008, MacPro 3,1) with the OEM Nvidia GeForce 8800 GT graphics card.
Last night when I got home from work I booted up the machine and the fan on the 8800 came on full blast, it has always done this for 3-4 seconds on boot and would then spin down again. The thing is this time it never spun down, it kept going full blast and has ever since. The card is not under heavy load and is cool to the touch. The fan keeps going full speed so long as the machine is on, regardless of activity. Only when it goes to sleep or is shut down does the fan stop.
I've tried resetting the PRAM, resetting the SMC, and even ran Apple Hardware Test and it returned no errors. I have iStat Menus installed but I don't believe it is capable of showing feedback on the card. I haven't been able to find much online about this issue and there are apparently no Mac versions of Nvidia's control and monitoring software for their cards.
I took it into the local Apple store today and the Genius Bar almost immediately told me its a flat-out replacement issue. The machine is out of coverage so ordering a new copy of the same card is expensive ($380). I've looked into other, newer cards like the ATI 5770 or 5870 through Other World Computing and they seem like good options.
Has anyone else come across this problem or know of a workable solution?

I replaced the card. At first I took it to the Apple Store but the person there said its basically just a somewhat common hardware failure on the card. Not much to do but repair or replace it.
Rather than spend the time and money to have them diagnose it further just to tell me the same thing I replaced it outright with a card from Other World Computing; the ATI Radeon HD 5770. IT was a good alternative for my machine which, due to it's hardware configuration, has only a few to pick from as viable replacements. It's been working fine so far, no complaints. Just be aware it is a BEAST of a card and puts out a lot of heat.

Suddenly no video, fans full blast?

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