Hi Matt, Still could be a flakey Firewire 800 port, or perhaps could be a software or incorrect setting on the 27-inch iMac Yosemite. Are you using Path Finder 7.6? Check your PF settings to make sure you don’t have this checked. Click on the gear icon in the bottom left of PF sidebar, Standard checked for the sidebar, then scroll down to “Hide Selection” and is “Devices" checked?
I prefer to use the Mac’s Finder. I’m also a bit perplexed when you mention the external drives are 1GB backup external drive & 1.5GB Movie… very small externals for backup & Movies, don’t you mean 1.5TB & 1TB drives? Cheers, Ronni > On 27 Sep 2017, at 12:11 pm, Matt Falvey <mmfal...@bigpond.net.au> wrote: > > Hi Ronni, sorry for taking so long Telstra have just finished reconnecting us > to the world after 5 days. > > I tried reseting the SMC and then the PRAM on startup and the problem still > occurred. > > As I had 5 days to think things over I went through my mind as to what had I > changed since I started using the iMac and the occurrence of the FW 800 not > working. > > The only thing I could think of was that I started to use, virtually > exclusively, Path Finder. > > So I closed Path Finder down, did the SMC and PRAM the connected the 1GB > backup External HD and it showed up! (I quickly backed everything up while it > was there) > > I was on a roll, so I ejected that and connected the 1.5GB movie file > External HD and that did not show up? > > I disconnected it and did an SMC and PRAM and connected it, no show. Did the > same and switched cables from the 1GB to the 1.5GB, no show. > > > Then connected the 1.5GB External HD to the 20” iMac and it showed up with > both sets of cables > > So now it seems as if I can get one External HD to work but not the other > > Thanks > > Matt. >> >> >> ————————————————————————————————————————————————————————————————————————————————————- >> >> Hi Matt, >> I would suggest you have a dead Firewire 800 Port unfortunately. >> As a last resort you could try - unplug the iMac for 15 seconds, then on >> Startup zap the PRAM (Command-Option-P-R) for three boots. Then test the >> Firewire 800 Port. >> Otherwise it?s a new logic board replacement which unless you are covered by >> extended warranty costs a lot of $$$ >> >> If the Zapping the PRAM doesn?t help, perhaps contact Daniel of MacWizardry >> for him to have a look at the iMac. >> >> Cheers, >> Ronni >> Sent from Ronni's iPhone 7 Plus >> >>> On 23 Sep 2017, at 6:27 pm, Matt Falvey <mmfal...@bigpond.net.au >>> <mailto:mmfal...@bigpond.net.au>> wrote: >>> >>> Hi Ronni, >>> >>> The external HD began to stop working about 12 to 14 months or so ago. It >>> would be intermittent at first, sometimes it would not connect and other >>> times it would, As I was generally using the monthly back up it was not big >>> deal. More recently I had to use the SMC reset to get it to work. Then >>> about 4-5 months ago I bought a USB hard drive for the back ups, as it >>> didn?t seem to connect at all and put it out of my mind. >>> >>> Neither of them show in Disk Utility. >>> >>> System Profiler under Hardware says - FireWire Bus: Maximum Speed: Up to >>> 800 Mb/sec >>> >>> Neither shows in System Profiler when connected to the FW800 port >>> >>> >>> >>> I connected them to the 20? iMac and in the System Profiler they showed up >>> - FireWire>FireWire Device Tree>FireWire Bus>My Book >>> >>> The same with Disk Utility, they showed up as a disk on the LHS. >>> >>> Take care. >>> >>> Matt. >>> >>> >>> >>> Hi Matt, >>> >>> When did these external HD stop showing on the Desktop? >>> Do either of these external HD show in Disk Utility on the 27 inch iMac? >>> Have you checked the FW800 port in System Profiler? >>> When connected to the FW800 port do they show in System Profiler: under >>> Hardware - FW800 - status: ? >>> >>> Cheers, >>> Ronni >>> >>>> On 22 Sep 2017, at 12:44 pm, Matt Falvey <mmfal...@bigpond.net.au >>>> <mailto:mmfal...@bigpond.net.au>> wrote: >>>> >>>> Hi, I have an iMac 27 inch Late 2009, 2.8 GHz Intel Core i7, running OSX >>>> 10.10.5, with one Firewire 800 port which does not work. >>>> >>>> I have two external HD?s, neither show on the desktop nor light up to >>>> indicate that they are operational when I connect them to the iMac. >>>> >>>> >>>> I also have an iMac 20 inch 2.4 GHz Intel Core 2 Duo, running OS X 10.9.5. >>>> If I connect either of the two above external HD?s to it they both show up >>>> straight away and I can see all the files on them. >>>> >>>> >>>> One of the external HD?s in my backup for the 27 inch iMac, the other >>>> contains large movie files so I really need the FW800 port to operate. >>>> >>>> >>>> By using external HD?s on the 20? I believe I have ruled out the cables as >>>> causing the problem as they both work. >>>> >>>> I have disconnected everything from the 27? and reset the SMC, still it >>>> does not show. >>>> >>>> I have connected the external HD to the 20? and made it active and then >>>> tried to piggy back it, using its other FW800 port, and one of the tested >>>> cables, to the 27?, it still did not show up. >>>> >>>> I did the exact same as above and put an SMC reboot in the middle. >>>> >>>> >>>> Anyone have any ideas on a possible remedy? >>>> >>>> Thanks >>>> >>>> Matt.
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