Disable Faulty FireWire Ports In 10.4.11

my powermac's firewire ports are fried, and it causes all kinds of problems (slow startup, random freezes, computer won't sleep).
i found this:
sudo -s
Password: (enter admin password)
cd /System/Library/Extensions
cd IOFireWireFamily.kext/Contents/PlugIns
mv AppleFWOHCI.kext AppleFWOHCI.null
touch /System/Library/Extensions
which disabled the built in firewire ports, and solved all of my problems...but it also disabled the firewire ports on the PCI card i put in.
is there a way to disable to built in ports, but not the ports on the PC card?
i know very little about this, so any help is appreciated.

Hmmm, are your 10.4 Install Discs more than one?
Just tried my Mac Mini, 10.4.2 Install Discs which is a 4 or 5 set, and indeed AB was a generic icon & small, I believe more resides on other Discs in the set, likely #2.
Have you considered...
If all the above fails, then it appears to be time for a relatively painless Archive & Install, which gives you a new/old OS, but can preserve all your files, pics, music, settings, etc., as long as you have plenty of free disk space and no Disk corruption, and is relatively quick & painless...
http://docs.info.apple.com/article.html?artnum=107120
Just be sure to select Preserve Users & Settings.

Similar Messages

How How can i install Mountain Lion with faulty firewire ports??

Basically the firewire ports are fried on my MBP 3.1 (2007). My mac used to take hang on blue screen and take 10 mins to boot but I solved this problem by installing an ssd and deleting the following kext file...
/System/Library/Extensions/IOFireWireFamily.kext
My MBP now boots in under 20 seconds so if anybody is having the same issue then there is the resolotion..
Anyway these are the steps I have taken but failed to properly install ML.
Dowloaded Mountain Lion at least 3 times from the App store to make sure the download wasn't corrupted.
I even tried making a Lion Bootdisk so I can install Mountain Lion on a USB drive (Install ESD.dmg).
I have even tried installing Lion first thinking I would take it one version at a time but gets stuck on boot screen too.
I even changed my hard drive to a new blank SSD drive to see any difference.
Each time I install Mountain Lion or Lion, everything is good until the installer has to restart the laptop.
Laptop gets stuck at the grey boot screen with the Apple logo and the loading circle. Nothing ever happens after.
I always had to use/boot to the Snow Leopard CD so I can restart the laptop back to the Snow Leopard OS and then update to 10.6.8.
I am guessing it is the ML dmg reinstalling the above file ( /System/Library/Extensions/IOFireWireFamily.kext ) which is leading to the same issue because of the faulty firewire ports.
Is there anyway I can resolve this because its doing my head in and Snow Leopard is old and doesnt support newer software that I would like to use.
Any help would be kindly appreciated. Thanks

Kurt Lang wrote:
Just some thoughts.
I presume you already partitioned the new SSD drive as GUID?
Is there anything on the new drive at all yet, or anything that isn't already backed up? If not, you could try erasing the drive and then installing OS X from the bootable flash drive installer you made.
Ive tried that and yes it is GUID. Im going to get grey hairs soon and Im not even 30 lol .... yet
I am not going to buy a new logic board as its just not logical (sorry for the pun) I got the mac for free and I want to spend as little money as possible. Im running out of ideas though

Faulty firewire port on DV7-3080ca: can't capture video

I have a Pavilion DV7-3080ca laptop, and I cannot properly capture video from my (Canon HV20) video camera, which I connect to the laptop's firewire (1394) port. Regular video can be captured but not without many dropped frames, and HD Video cannot be captured at all. When I connect the camera to the firewire port, the camera says "HDMI Out" on the camera screen, instead of "DV Out" as it should say, so there seems to also be a recognition problem.
Searching on the Internet, I've learned that the problem is likely the Ricoh chipset that this firewire port uses, which is apparently more problematic than the preferred Texas Instruments (TI) chipset that some other laptops use for their firewire port.
Does anyone know if there's a fix for this? Is it something that HP could fix with a future BIOS update? I was hoping that it may have been corrected in the last BIOS, but I just flashed my DV7 BIOS with the latest version from the HP web site (F.13), and it didn't help. I've also updated the graphics driver and the Intel chipset drivers; that didn't fix the problem either.
My other alternative, if there is no fix, is to purchase an Expresscard with firewire ports that uses the TI chipset. Does anyone know if that would solve my problem? I don't want to spend the extra $50 if it won't.
Some people speculate that the problem with the DV7 firewire ports is also partly because it shares IRQ16 with several other functions, in which case the Expresscard solution won't work, because I think it's on IRQ16 too.
Any tips would be most appreciated. I've tried contacting HP via Help chat and email, but neither response even acknowledged that the firewire port's Ricoh chipset is faulty, even though that seems to be common knowledge on the web.

Has anyone tried to capture video with a firewire Expresscard rather than with the faulty Ricoh-chipset-based firewire port that's built in (but faulty) on the DV7 laptop?
It's my last hope, but I'm not optimistic. Some say it won't help because it shares IRQ16 with lots of other functions. Don't really want to spend another $50 to work around a firewire port that should work properly in the first place, but I really need to be able to capture DV footage with this laptop.
Have tried to contact someone at HP who's familiar with this problem, but no luck.

Howto disable 1394 firewire port in audi

I have a firewire port in the Audigy 2 audiocard, and also a firewirecard with 3 inputs, supplied with the motherboard.
I cannot use the firewirecard of the motherboard for some reason or the other. When I plug in a camera, this device is not recognized. It is recognized when I plug it in into the Audigy2 card.
How can I use the firewirecard of my motherboard? Do I have to disable firewire on Audigy2? How to do this?
thanks for helping me
Romain

You cant remove the soundcard firewire (OCHI compliant firewire) but you can disable it and thereby it will not use a IRQ anymore.
Go to your device manager, choose the firewire, double-click and choose deacti've---done
I would check that there are no X markings on any firewire device in the device manager and if there is then there might be a conflict and I would recommend to check that you connected the firewire cables correct inside your computer (refer to your manual and check the pin layout).
Good luck!

Disabling the Firewire Port

Okay, so long story short, I got some Axe Bodywash got stuck in my Firewire port. This is causing electricity to "boil" the shampoo in the firewire port, causing smoke and a horrendous smell to come out of the port. It's already completely useless now, but I keep getting notifications saying that my Firewire Port has been disabled. Now, it's turning off and on again because I keep getting these notifications. How can I permentantly disable the function of the port for safety purposes and since it's draining battery at a much faster, noticable rate?

I would opt for getting the port professionally cleaned. Take it into a Apple Store.

Faulty Firewire port- how much to fix?

I previously posted a question about my ipod because it wouldn't appear on my computer. I found out that there's a problem with the firewire port. Any ideas on how much it would cost to get fixed? Also, is there anywhere besides Apple where I can drop it off to get fixed? (ex Best Buy etc)

www.ipodresq.com or www.ipodmods.com

ITunes 7.0.1 disabling Firewire Ports

Hi, I have a G4 iMac, running 10.3.9. Recently I upraded to iTunes 7.0.1 and it totally disabled my firewire ports. I have 2 external harddrives plugged in to these firewire ports. I've tried all of the solutions I've found in these forums (unplugging, resetting pram, combo update) but still no good. Do you think that if i downgrade to a previous version of iTunes my firewire ports will magically appear? Any other solutions or am I screwed? Thanks for any help.

Same thing happened on my G4 with Itunes 7...my 3 year old "dock" Ipod is no longer recognized (although the rest of my firewire ports seem OK)....huh??

IMac firewire port is not working

iMac firewire port is not working
Hi everybody, Happy New Year.
I am a 72 years old semi-newbie in video editing, because Iedit only 1 or may be 2 movies a year since 2007 and I have only very little computer knowledge.
I received a new 27” iMac as a birthday gift 14 months ago. About 10 months ago, with help, I successfully use the Migration Assistant to transfer some datas from my old power G4 to the iMac including two Final Cut Express projects. I had one project successfully done; burned to DVD and I save it with Print To Video. Last week, I have my second project done, I burned the sequences into DVD but unable to do a Print To Videodue to the iMac is not communicating with my Sony camcorders DCR VX1000, this is the same camcorder I used on the last job which was working a couple of months ago.As a result, I try to switch the Easy Setup with different Format and different Use; I refresh the Canvas window; I did a Mix down; move the Screen Saver to NEVER as well as the Energy Saver set to NEVER SLEEP. I also trashed the preferences (plist) folders; run the Utility repair, I replaced the firewire cable (4 pines – 9 pines 800), but nothing work. Up to this point, I think that there is no signal from the firewire port to the camcorder because I understand when the sequences is ready, the firewire is connected between the computer and the recording camcorder, the Print to Video is activated, then the word DV- IN should be seen on the recording deck screen. This time, I don’tread such words on the recording screen. Therefore, I think there’s no out going signal from the iMac to the recording camcorder and the iMac is not receiving signal from the recording camcorder. At this point, I try to connect my iMac to the power G4 to see if I can do some data transfer. Follow the procedures, I hook up the data transfer cable between the G4 and the iMac, I can the fireswire icon moving on the G4 screen but no indication on the iMac screen (there should be some indications in the source bar), this shows me the iMac did not recognize the G4 which worked on previous data transfer. It looks to me the firewire port on my iMac is dead. What has gone wrong? Could I accidentally disabled the firewire port by some magic keystroke? (i.e. accidentally fat finger some thing to make it stop working? Oh, by the way, during the playing around, went to the Final Cut tool bar, I click the View >Video Out > Digital Cinema Desktop Preview – Main, the result was a black screen and the esc key was my rescuer - LUCKY LUCKY! Are there any other trouble-shooting techniques to apply before bringing to shop? Please help!
Sorry for such a long statement, forgive me for unable to make it shorter. Thank you for your patience. Thanks to all the folks in this board for being so helpful.
p.s.

Not sounding good.
If the system Profiler does not see it then there is a basic communication problem between camera and the Mac.
I'm thinking the Firewire port is the culprit as some 800 ports were faulty.
I'd suggest taking the Mac, cable and camera to your nearest Authorized Apple Service Centre and get them to diagnose the issue. eg. let them try to connect the two devices.
Right (control)click the Sequence icon in the Browser and select Item Properties, do the same for a clip.
You can also post screen shots for the Properties.
Al

Dead firewire port

Seems my firewire port suddenly died. I tried plugging in my iSight and it's not detected, and I tried a firewire hard drive as well, and that is not detected.
Any steps I should try on my own before contacting Apple for APP repair?

After installing firmware password protection, I found out that it disables your firewire ports.
So I disabled the password, but my firewire ports are still dead, i can use targetmode, but my mini never mounts, I tried connectiong isight and it didnt work also, I did some research on this and found the code that checks the firmware for this setting.
is located on the file IOFireWireController.cpp
it looks to me as if the security-mode is set to none, once it was set to anything else other than "NULL" value it will still disable the firewire. so i tried to set it to NULL also but no luck. My Firewire is dead, and also my other laptop that had a firware password has the same problem. I've tried:
altopt+of
setenv security-mode none.
rest-nvram
reset-all
return.
Then
reset the PMU.
but nothing.

Satellite M100 - Does a disabled firewire port saves battery power?

Hey everybody
I do not need IEEE so..
If I disable firewire in device manager will it turn it off and will it help to save battery power?

Hi Dmitrij
I doubt that disabled firewire port will help you to save battery power.
If you want to save the battery power you should check the Toshiba Power Saver settings and options.
Check the HowTO document
+How to setup my computer for optimum battery usage?+
You can find it in Forums HowTo area.
If you are using the Vista then I recommend checking the Vista Power settings.
More details you will find in "HowTo" doc:
+How to handle the power managment features of Windows Vista?+
Cheers

Firewire port disabled by G-Drive

What would cause my Mac Pro to shut down one of its firewire ports?
I just got a 1TB G-Drive and hooked it up to one of the FW800 ports on my 2008 Mac Pro (running 10.5.8) in place of my current Freecom drive that's been running perfectly for a year and more.
Powered on the drive, then the Mac and... nothing. Tried hot-plugging the drive: still nothing. Checked in Disk Utility and the physical drive wasn't visible. Plugged the Freecom back in and it wasn't recognised. Unplugged my Time Machine drive from the other FW800 port and plugged the Freecom in there and it came up straight away.
At this point I was getting a bit upset. The FW800 port I'd plugged the G-Drive into appeared to be dead: any FW400 or FW800 device plugged into it was ignored. Doing an SMC reset has brought it back to life, but I'd like to know what could cause this since I now don't dare plug the G-Drive into any of my computers in case it kills them.
Any suggestions?

FWIW, I had a similar issue recently, and the culprit was a faulty drive-interface connection.
If other FW drives are working, with the same cable, it's most likely a defective G-tech unit you got .
Also, if one off your FW ports goes down, don't panic, just reboot and wait a little while, it might come back on.

How can I tell if my firewire port is faulty?

I recently cannot import video from my canon elura 100 which connects using a 4-6pin firewire cable. I thought maybe it was the cable so I grabbed my brother's black macbook and it seems to import fine, it still isn't 100% smooth like I think it should be but when I plugged the camera back into my black macbook, the video that was being imported just kept freezing and it seemed warped. I tried this process a few times and kept getting the same results. I feel as though I may have a firewire port issue. How could I check on my own. I know that when I use my firewire 410, I have no problems so I don't know what could be wrong. Any help?

Did any of your problems start with Snow Leopard, is your brother's machine running the same version of SL.
Over in the audio forum there are those having some problems with their firewire interfaces. (glitches, static...etc)
pancenter-

Full Firewire Port Failure (three different machines : iMac Intel, iMac G5, Black Macbook)

I'm experiencing a failure of all FireWire ports on all of my three machines. I believe this problem began with a faulty external, FireWire powered hard drive from G-Tech. Here are all my specs, followed by a rundown of the order of events that has lead to this situation, followed by the various troubleshooting I have done.
Equipment :
iMac Aluminum Intel - 24" Mid 2007 - running OsX 10.5.8 - currently 1 FW400 and 1 FW800 ports disabled
iMac G5 - 20" - running OsX 10.5.8 - currently 2 FW400 ports disabled
MacBook - 13" black Early 2008 - running OsX 10.5.8 - currently 1 FW400 port disabled
2 500GB G-Drives (by G-Tech) - AC powered
1 5TB G-RAID Drive (by G-Tech) - AC powered
1 250GB G-Drive Mini (by G-Tech) - FW powered
Initial Setup :
1 500GB G-Drive connected directly to iMac Intel via FW800
1 500GB G-Drive connected to first 500GB G-Drive via FW800 (daisy chained)
1 250GB G-Drive connected to second 500GB G-Drive via FW400 (daisy chained)
1 5TB G-RAID connected directly to iMac Intel via FW800>400 adapter
Sequence of Events :
I had transferred some files to my G-Drive Mini in order to move them to my MacBook from my iMac Intel. I copied the files to the G-Drive Mini and ejected it normally and plugged it into my MacBook via FW400. The drive would not mount, and the power indication light would not go on. After experimenting with various connections and cables I was able to get the drive to power with FW400 and USB connected at the same time, but the drive would still not mount.
I then plugged the G-Drive Mini back into the 2nd 500GB G-Drive as it was previously connected via FW400. This action caused the G-Drive to immediately reboot and eject itself from my iMac Intel.
I then attempted to plug the G-Drive Mini into my older iMac G5 via FW400. Immediately upon plugging in, the computer shut down, and would not restart.
At this point I kind of started to freak out. I was unaware of the extent of the damage, but was upset that the FW powered G-Drive Mini had shutdown my iMac G5. I contacted G-Tech Support and they offered to replace the drive and instructed me how to manually reset the computer's SMC by opening up the iMac and finding the Cuda switch. This worked and the computer was able to start and function again, but the FW400 port seemed to be disabled.
I then tried to swap out configurations and drives on my iMac Intel to see if there was any cable problems, but doing so, slowly rendered all my FireWire ports useless. It's almost as if the act of plugging in the FW-powered G-Drive Mini started a kind of shortout chain reaction. I soon learned that none of my hard drives would connect to any of my three machines, with any kind of cable combination via FW400 or 800.
I am currently able to connect my 5TB G-RAID drive to any machine via USB, as well as my G-Drive Mini. I am unable to access the other two external hard drives, as one has only FW400 and 800 ports and the other's USB connection is not functional as well on any machine.
Troubleshooting Steps Taken :
I have on all machines, reset the SMC in the following methods. iMac G5 - manually, by opening the case and pressing Cuda switch. iMac Intel - unplug, hold power button, restart method. MacBook - unplug, hold power button, restart method.
I have also on all machines, reset the PRAM by the Cmnd + Opt + P + R method at startup.
I have also unplugged all cables / removed battery, from all machines and left alone for a period of at least 12 hours, then re-plugged in each device one at a time.
I have also restored my hibernate mode (through Terminal) on my iMac Intel to mode 3 and also turned on Virtual Memory in system preferences and set hibernatemode to mode 7, the restarted and attempted to plug in devices. The reason I even began to deal with the hibernate mode was because I had around the same time my ports began malfunctioning, installed the DeepSleep widget, which allows you to control your computer's hibernate mode. I thought that tweaking with this setting may have made my computer incapable of recognizing devices that were plugged in. I have since uninstalled the widget and experimented with different hibernatemodes to no avail.
I also have Repaired Disk Permissions and Repaired Disk on all my machines, from within my Admin User as well as from the OsX Install Disk.
Sometimes in my System Profiler (like right now for example on my iMac Intel) my computer is "Unable to list FireWire devices," but sometimes, no warning message comes up and it simply displays the appropriate Bus speed.
I also conducted a system restore using a backup from my 5TB G-Raid Drive via USB, to a date before these problems started, but my ports are still not working.
Summary :
I am looking at a situation where all my FW ports on all my computers appear to be disabled, and possibly also on my four external hard drives, with one possible USB port malfunction on one external drive. The only root of this seems to be a malfunctioning FW-powered external hard drive.
Is this possible? Has this happened to anyone else before? G-Tech assures me that it is impossible for my 250GB G-Drive Mini to draw enough power from a computer to permanently disable any ports, but I have tried all of the FW port problem troubleshooting steps and am at a loss.
I do not have AppleCare and would like to avoid bringing two iMacs, a MacBook and four hard drives to the Apple store and take my chances with the geniuses.
I would appreciate any help or advice you all have. Thanks for reading and for your support!

Ok. So if that was too confusing, I've re-labeled this post with letters for my hard drives and some mapping of the connectivity configurations I have attempted.
Equipment :
iMac Aluminum Intel - 24" Mid 2007 - running OsX 10.5.8 - currently 1 FW400 and 1 FW800 ports disabled
iMac G5 - 20" - running OsX 10.5.8 - currently 2 FW400 ports disabled
MacBook - 13" black Early 2008 - running OsX 10.5.8 - currently 1 FW400 port disabled
1 500GB G-Drive (by G-Tech) w/ no USB port - AC powered : A
1 500GB G-Drive (by G-Tech) w/ USB port - AC powered : B
1 5TB G-RAID Drive (by G-Tech) - AC powered : C
1 250GB G-Drive Mini (by G-Tech) - FW powered : D
Initial Setup :
C > FW400-800 adapter > iMac Intel
D > FW400 > A > FW800 > B > FW800 > iMac Intel
Sequence of Events :
D > FW400 > MacBook
I had transferred some files to my G-Drive Mini D in order to move them to my MacBook from my iMac Intel. I copied the files to the G-Drive Mini D and ejected it normally and plugged it into my MacBook via FW400. The drive would not mount, and the power indication light would not go on. After experimenting with various connections and cables I was able to get the drive to power with FW400 and USB connected at the same time, but the drive would still not mount.
D > FW400 > A > FW800 > B > FW800 > iMac Intel
I then plugged the G-Drive Mini D back into the 2nd 500GB G-Drive A as it was previously connected via FW400. This action caused the G-Drive to immediately reboot and eject itself from my iMac Intel.
D > FW400 > iMac G5
I then attempted to plug the G-Drive Mini into my older iMac G5 via FW400. Immediately upon plugging in, the computer shut down, and would not restart.
At this point I kind of started to freak out. I was unaware of the extent of the damage, but was upset that the FW powered G-Drive Mini D had shutdown my iMac G5. I contacted G-Tech Support and they offered to replace the drive and instructed me how to manually reset the computer's SMC by opening up the iMac and finding the Cuda switch. This worked and the computer was able to start and function again, but the FW400 port seemed to be disabled.
I then tried to swap out configurations and drives on my iMac Intel to see if there was any cable problems, but doing so, slowly rendered all my FireWire ports useless. It's almost as if the act of plugging in the FW-powered G-Drive Mini D started a kind of shortout chain reaction. I soon learned that none of my hard drives would connect to any of my three machines, with any kind of cable combination via FW400 or 800.
D > USB > AnyMachine
C > USB > AnyMachine
I am currently able to connect my 5TB G-RAID C drive to any machine via USB, as well as my G-Drive Mini D. I am unable to access the other two external hard drives, as one has only FW400 and 800 ports (A) and the other's USB connection is not functional as well on any machine (B).
Troubleshooting Steps Taken :
I have on all machines, reset the SMC in the following methods. iMac G5 - manually, by opening the case and pressing Cuda switch. iMac Intel - unplug, hold power button, restart method. MacBook - unplug, hold power button, restart method.
I have also on all machines, reset the PRAM by the Cmnd + Opt + P + R method at startup.
I have also unplugged all cables / removed battery, from all machines and left alone for a period of at least 12 hours, then re-plugged in each device one at a time.
I have also restored my hibernate mode (through Terminal) on my iMac Intel to mode 3 and also turned on Virtual Memory in system preferences and set hibernatemode to mode 7, the restarted and attempted to plug in devices. The reason I even began to deal with the hibernate mode was because I had around the same time my ports began malfunctioning, installed the DeepSleep widget, which allows you to control your computer's hibernate mode. I thought that tweaking with this setting may have made my computer incapable of recognizing devices that were plugged in. I have since uninstalled the widget and experimented with different hibernatemodes to no avail.
I also have Repaired Disk Permissions and Repaired Disk on all my machines, from within my Admin User as well as from the OsX Install Disk.
Sometimes in my System Profiler (like right now for example on my iMac Intel) my computer is "Unable to list FireWire devices," but sometimes, no warning message comes up and it simply displays the appropriate Bus speed.
I also conducted a system restore using a backup from my 5TB G-Raid Drive C via USB, to a date before these problems started, but my ports are still not working.
Summary :
I am looking at a situation where all my FW ports on all my computers appear to be disabled, and possibly also on my four external hard drives (A, B, C, D), with one possible USB port malfunction on one external drive (B). The only root of this seems to be a malfunctioning FW-powered external hard drive.
Is this possible? Has this happened to anyone else before? G-Tech assures me that it is impossible for my 250GB G-Drive Mini D to draw enough power from a computer to permanently disable any ports, but I have tried all of the FW port problem troubleshooting steps and am at a loss.
I do not have AppleCare and would like to avoid bringing two iMacs, a MacBook and four hard drives to the Apple store and take my chances with the geniuses.
I would appreciate any help or advice you all have. Thanks for reading and for your support!

G5 losing all Firewire ports??

Just turned on my Mac G5 Dual 2.3Ghz which has been running perfect before and i think my firewire ports on the machine have been disabled??
I have an External FW800 Hard drive with sample libraries, and the FW400 MOTU 828mk2 soundcard.
For some reason both arent being recognised?? My drive automatically pops up on my desktop when i boot up buttoday it isnt there!?! And opening logic 7 it says
"MOTU not found - Apples Own built-in Audio will be used for this session instead"
I have a 2nd external FW400 drive that was unplugged when powereing up the Mac, and i plugged that in and that isnt seen either?!!! (it always pops up no problems)
BUT....
All my USB's seem to be fine? i have a Digidesign Mbox and M-audio USB keyboard, that still works and obviously my Logic USB Dongle to open Logic seems fine..
I have had this a couple of times within the last 2 weeks, and everytime a reboot (unplugging from the wall) and restarting has cured this..
Whats going on? and is there a cure???

yes this happens to me if i try to do anything firewire related i.e. burn a cd from an external FW drive if i use Itunes (songs are on a external FW drive) and sometimes it just dropes. I bought a 2nd pci express card 2 weeks ago and it blew out the firewire ports. Apple replaced the logic board and now i am a little hesitent to put another PCI express card in my computer, so for the time being i am turning my Onyx 1640 on and off when it drops out and sometimes only a restart will work. good times
dual core 2.3 Mac OS X (10.4.6) 6 gigs ram etc etc
dual 1.25 g4 Mac OS X (10.3.9)

Firewire ports go bye-bye

Suddenly I am unable to use devices through my firewire ports. They do not show up in ABOUT THIS MAC, More Info.
Any clues.....????
Gracias!!!
emac Mac OS X (10.3.9)

biffff,
Welcome to the Apple Discussions!
A momentary powerglitch or plugging in a Firewire device with a faulty ground likely caused teh Firewire bus's fuses to latch up. Reset the eMac's switching Firewire bus triple fuses by removing all peripherals other than the keyboard and mouse, then removing the power cord from the side of the eMac (to remove the trickle current drawn by modern electronics even when nominally off) and waiting 15+ minutes. Then reattach the power cord only and restart. Check Apple’s System Profiler (in Applications/ Utilities) and confirm that the Firewire bus is recognized. Reattach peripherals one at a time, checking System Profiler after each to confirm the addition is recognized. If Firewire drops put of System Profiler after adding a particular device, repeat the process but swap a known-good Firewire cable with the suspect device; that will let you narrow it down to the device or to the cable. An Uninterruptible Power Supply will protect the Mac from power glitches and brownouts.

Disable Faulty FireWire Ports In 10.4.11

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