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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

Hello to all and Firewire problem


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tony2

 
Member Since: Jan 21, 2014
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Hi,
New to the forum and looking forward to being educated in all things imac.
I have a Mid 2010 27 inch i3 imac which has been totally fault free until this morning.
I have 3 firewire external hard drives attached and last night I unmounted the drives as usual, turned off the power to them but, the first drive in the chain still showed the power light (not done this before) so I removed the firewire cable and the light went out. I closed down the imac and retired to bed.
This morning, I started the imac, turned on the external drives but, none of them mounted or showed on the desktop. I have read through various posts and tried all suggested (SMC reset, Pram reset etc) but, nothing has worked, the imac refuses to see the drives. I have swopped out cables and power supplies and are now using USB 2 which works fine.
Any help and advise would be most appreciated.
Thanking you in advance.......Tony.
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bobtomay

 
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If all the drives are working via USB, then at least the drives are ok.

Am "assuming" you had them daisy chained.
Would try them one at a time via firewire.
None of them recognized, change the cable.
Suggest you should be looking in Disk Utility rather than the Desktop or Finder at this stage.

I cannot be held responsible for the things that come out of my mouth.
In the Windows world, most everything folks don't understand is called a virus.
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tony2

 
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Thanks for your reply.

Yes the drives are "Daisy Chained.
Tried all 3 drives individually.
Tried using different firewire cables.

Discs do not show up in disk utility
System Profiler shows
FireWire Bus:

Maximum Speed: Up to 800 Mb/sec
It's as if they are not connected ?
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bobtomay

 
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Would try both - SMC and PRAM reset.

After that, would try them on a different computer.

I cannot be held responsible for the things that come out of my mouth.
In the Windows world, most everything folks don't understand is called a virus.
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tony2

 
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Ok, thanks.
I have tried SMC and Pram resets a few times, my plan of action now is to shut down the imac this evening, unplug everything and leave over night ( 12 to 13 hours was suggested in a you tube video ) then boot up tomorrow and carry out Pram reset.
I will post the results.
Thanks again for your time.
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tony2

 
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Sadly, I have to report that the Firewire 800 ports still do not work.
Maybe that part of the Logic Board has failed.
I read somewhere on the net that if the PRAM battery is low, it can cause this problem with the Firewire Ports ?
Can anyone confirm this to be true ?

Thanks.
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chscag

 
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I doubt your PRAM battery is bad or low since your machine is a 2010 model. I've always been reluctant to daisy chain drives whether they be firewire, SCSI, or what have you. The reason is that a problem with one or more of the drives or cables can cause damaging current flow through the chain. While it may not damage the drives themselves it can cause a problem with the main board (logic board).

I would make an appointment with your local Apple Genius bar and have them run diagnostics. There shouldn't be a charge for that provided you go to a genuine Apple store not an authorized Apple repair service.
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tony2

 
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Ok, thank you for your input.
I am thinking that the logic board is damaged, after the drive light remained on after turning off the mains power.
I will be visiting my Son next week and will try my drives and cables on the Firewire port of his Macbook.
If all is ok then it's off to the repair shop.
Will keep you posted.
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