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 <[email protected]> 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 <[email protected]> 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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