Imac not recognising firewire HD

I have a LaCie external hard disk and I've connected it via firewire but it's not seeing the disk. It used to work fine when I had it connected via USB to my airport express but I need the firewire connection to do a full (and faster) backup. Any ideas? Thanks.

Have you tried resetting the Firewire port and the PRAM? See these two articles if you don't know how:
http://docs.info.apple.com/article.html?artnum=88338
http://docs.info.apple.com/article.html?artnum=2238
If it doesn't work, check LaCie's website to find out if you have the latest firmware for their drive. If you do, e-mail LaCie support and tell them of your problem. Their e-mail address is firewire AT lacie.com.

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Help - iMac not recognising speakers

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I hope this is posted in the right place, if not my applogies.
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I believe that the port on the back of your iMac that you think is "Line-Out" is actually an "Audio in / optical digital audio in" port.
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"The only way, and then after much messing about, to get the video off the card is to directly connect the camera to the computer."
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IMac not recognising iPad2 or iPhone

Whenever i plug my iPhone 4s or iPad2 into the USB and ocnnect it to my iMAc, the iMac won't recognise it.
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SMC RESET
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Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
PRAM RESET
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Make sure the disk is REALLY clean. No smudges or scratches. If that doesn't help you should be able to order a replacement set from Apple.

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
Note: If FileVault is enabled under Mac OS X 10.7 or later, you can’t boot in safe mode.
Safe mode is much slower to boot 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 your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem(s)?
After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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My iSight was working fine for a year then suddenly ichat / photo booth / skype all stopped recognising it. They all say no camera connected.
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If you have tried all the relevant suggestions without success, you will need help from an Apple Approved Service Provider. If you have no access to local Apple service technicians, the following links may be useful:
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http://www.apple.com/support/isight/service/
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This is clearly a Leopard issue, there are no problems with the drives or the firewire connections or the cables, they all work fine on the work computer and my other home computer (powerbook laptop G4) and as I said the upgraded emac will recognise them from usb. And since it's three different kinds of drives that all work on other computers but all stopped working on the single Leopard upgrade it's not a Lacie, Maxtor or G-drive problem.
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Many threads complain that Apple was not recognising the problem, maybe there is also some progress there?
thanks in advance for any help!

It's still possible that there is now a hardware issue, and if so it might respond to resetting the FireWire bus. This can often be done by just unplugging the power cord for a few minutes.
From
*What to do if your computer won't recognize a FireWire or USB device*
http://support.apple.com/kb/HT1317?viewlocale=en_US
# Shut down the computer.
# Disconnect all devices and all other cables, except the keyboard and mouse cable(s).
# Disconnect the computer from the power outlet and wait for 3 to 5 minutes.
# Plug the computer back in and turn it on.
# Reconnect the device(s) (one at a time if there is more than one) and test. Test with each port if you have more than one.
--------------------------

Can I transfer data from my G4 to my IMac over a firewire without them syncing or messing either one up - do not want to modify either one...!

Can I transfer data from my G4 to my IMac over a firewire without them syncing or messing either one up - do not want to modify either one...!

Boot the G4 Mac into Target mode...
http://support.apple.com/kb/HT1661
That should make the G4 look like a big FW drive to the iMac.

Hello, My old email address which I have used as my apple id for 10 years is being made redundant. I have changed the email address to a new gmail one and this is my new apple id. But my iMac has not recognised this. It keeps saying it wants the pa

Hello,
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This did not work for me. My old email account for iCloud still pops up on my screen every time I open my macbook. I've deleted it, reset it, every thing I can think of and it still shows up. I think six months of this is more than enough time to wait.
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I have just had my hard drive replaced,I downloaded my files to a hard drive and now when I try to re start my iMac it ask's me to enter my pass word I do that but it's not recognise my pass word,what do I do?

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http://osxdaily.com/2011/08/24/reset-mac-os-x-10-7-lion-password/

Imac not recognising firewire HD

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