FireWire Bus Out?

My FireWire ports became unresponsive suddenly yesterday. All of them - both FW400 and FW800. I'm trying to trouble shoot this myself before taking the machine into the Genius Bar (I think the AppleCare has expired).
When I go to the System Profiler and click on the FireWire tab I get this message: Warning: Unable to list FireWire devices (in red text)
Has anyone else experienced this? Is the FW Bus fried?
Here are links to images of the error and my system info.
http://i562.photobucket.com/albums/ss64/kdengs/Screenshot2013-05-03at104525AM_zp s50a57113.png
http://i562.photobucket.com/albums/ss64/kdengs/Screenshot2013-05-03at110806AM_zp s7783f9b0.png
Thanks for any help!

This happens sometimes with the Firewire ports. Try resetting the SMC.

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http://www.wiebetech.com/products/ultragbplus.php
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I had the same idea as you.
I didn't think of looking for a method of turning off the Mac's firewire power - this would be excellent.
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http://cgi.ebay.co.uk/2M-Firewire-IEEE1394-Cable-4-6-Pin-DV-out-PC-Lead-/2605482 48174?pt=UKComputing_CablesConnectors_RL&hash=item3ca9e2c26e#ht_2727wt1141
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http://cgi.ebay.co.uk/1394-Firewire-Adapter-6-Pin-Male-4-Pin-Female-/35040349329 7?pt=UKComputing_CablesConnectors_RL&hash=item5195acfdb1#ht_3761wt1141
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The combined 6pin plug and adapter were heavy. They needed to be supported to keep them level when plugged in, if the socket was horizontally aligned, like on the MacBook Pro.
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Hi, Thanks for the suggestion. I'm really trying to cut down on the number of devices that I leave plugged into the mains, so would ideally like a solution that relies purely on power supplied by the internal bus.
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reset-nvram
set-defaults
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I ended up unplugging computer for 5 minutes and re-plugging in and this seems to have solved problem (although I do not know why.)

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Unknown Device
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Did iSight blow up my firewire bus?

I was using ichat the other night when suddenly the video disappeared. the light on my isight camera went out and it was non responsive. When i went into system profiler it said the firewire bus was not there.
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I was running an IO Gear firewire hub, and wonder where the problem is. I pulled the cable from it, and tried that with the isight, nothing. however the isight WILL work on the rear port with its own cable.
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Firewire bus?

my firewire bus seems to occasionally turn off and on... I've tried different devices. sometimes the system profiler just says firewire bus... no other info at all. any ideas... this is what i've done so far...
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My friend a professional photographer just bought the quad g5 and is having this same problem running 10.4.4 He had an Apple authorized repair person check the hardware and found no problems. I checked the system profiler under firewire and it only said Firewire Bus speed 800 mb. He has a firewire card reader and cd burner neither were on the list. Also when he would try to read from the card reader he would get the spinning beach ball and had to physically unplug the G5 to restart it. This is BS Apple needs to address this issue this computer cost over $3500 and is less than 3 months old! Any help would be apprecieated.
Quad G5 Mac OS X (10.4.4) over 6 gigs ram

Firewire Port out to lunch! Formac Studio goes with it! Help!

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Hello Appleheads,
Looking for some help if you have a spare moment.
I just purchased a Phonic Firefly 302 Plus audio interface, and even though it is supposed to be able to be powered by the firewire bus, I am unable to get it to work. The unit's power light does not come on at all, however when using the external power supply that is also supplied it does work. I have tested two firewire cables, 1 of which I know works.
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Model Identifier: MacBookPro4,1
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Hartz.

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An interesting point has been raised to me though that has been discussed here: https://www.mhsecure.com/faq/index.php?action=artikel&cat=3&id=21&artlang=en&hig hlight=bus power
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Is there a way to manually reset firewire bus(ses)

I'm running Logic Studio (9) through an mLan Presonus Firestation and Yamaha Motif Rack XS. I have an addition al firewire card installed attached to a Focusrite Liquid Mix. The system is stable but isn't so flexible. If I change sample rates by mistake or change devices in the wrong order, the mLan system loses sync with the computer. The ONLy way to get the sync back is to close all of my audio programs and REBOOT the mac. This of course disturbs my workflow. Is there a way to reset the firewire bus(ses) through a software option without rebooting ?

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My external iSight camera will no longer work on my G4 iMac after upgrading to iLife 08. It works on my Powerbook G4 laptop so there isn't a problem with the UBS cable. I have compared System Profiler details on both laptop and iMac. On laptop FireWire- Firewire Device Tree- FireWire Bus shows iSight.
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Turn off and unplug from the power socket the iMac and leave for 20mins to reset the firewire ports.

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