My seagate external hard drive will no longer start up

my 1 TB seagate external hard drive stopped working. It won't light up, or show up on my desktop as an option for time machine back ups. any suggestions?

It won't light up, or show up on my desktop as an option for time machine back ups. any suggestions?
If it doesn't light up it is dead.. return if under warranty.. the power supply is probably gone, but the hdd could be dead.. Seagate have had some bad batches of these things.

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My WD external hard drive will not longer show up on my macbook pro. The light turns on and you can hear it running but it won't show up either in finder or in the disk utility. This happened a while ago but I really want to get all my photos off the hard drive. Is there anything I can do to get my computer to read it again or get my data off of it?
I don't have access to another Mac to test it.
Thank you

dead sata bridge card. very common problem.
see all about it here:
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verify HD on another Mac however, if same, dead SATA card most likely

My external hard drive will no longer connect to my macpro......any ideas on how to solve this problem??

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Reset the SMC, see this Apple note: http://support.apple.com/kb/HT3964
Also reset the PRAM:
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
In most cases, those two actions will fix the port issue. If it's still an issue, you may need to see if the external hard drive can connect to another system, to ensure it's not having problems.

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Can Disk Utility see it?

IPhoto library on external hard drive will no longer open

I'm hoping that someone will be able to point me to a simple solution to my problem...
I'm running iPhoto 9.6 on a MacBook Pro (Retina, 13 inch, mid-2014). The OS is Yosemite 10.10.1. Because the flash storage is only 250GB I have my main iPhoto library (146GB) on a partition of an external 1TB Lacie Rugged drive. The external hard drive also has partitions for Time Machine Backup and SuperDuper Bootable Clone. I have a separate, much smaller iPhoto library on the MBP which contains recent photos.
Yesterday I failed to reconnect my MacBook Pro to the power source when I put it back on my desk. The result was that the battery went below 5% and the MBP turned itself off and also ejected the external hard drive (some time after I reconnected the power cable there were dialog boxes on my screen informing me that each of the three partitions had been ejected incorrectly). I waited until the MBP was fully charged before I tried to open my 'main' iPhoto library on the external hard drive. I received a message that the library would have to be upgraded to work with the computer (very odd, because it had already been upgraded last October when I upgraded from Mavericks to Yosemite and has been working without any real problem ever since then).
After some hours when the only message on the screen was 'Rebuiding Thumbnail Caches' I pressed Cmd+Option+Esc I saw that iPhoto was 'Paused' - that message subsequently changed to 'Not Responding'. I 'Force Quit' iPhoto but the iPhoto library will not open at all from the external drive.
As a test I quit iPhoto and re-started using the Option key and chose to open the iPhoto library which is on the internal drive and it opened without any problem.
I recall that it used to be possible to fix this sort of thing (perhaps not) by trashing the com.apple.iPhoto.plist file, however, I don't seem to be able to find it :-(
I'm really at a loss as to how I should approach this problem and I would be very grateful for any suggestions that can be offered.
Cheers
Tricia

Further update ....
I downloaded and installed iPhoto Library Manager and then chose Library - Rebuild Library. Unfortunately, when it had finished the result was 0 images in any file or folder. I checked the log (which is incredibly long) but here's the beginning of it which seems to indicate that the problem is that an essential file is missing -
2015-01-21 10:49:18.671 iPhoto Library Manager 4.1.11; iPhoto 9.6; OS X 10.10.1; unregistered
2015-01-21 10:49:19.033 Rebuilding library /Volumes/Pictures/iPhoto Library
2015-01-21 10:49:19.033 Rebuilt library located at /Users/Tricia 1/Pictures/iPhoto Library (rebuilt).photolibrary
2015-01-21 10:49:19.035 Building preview…
2015-01-21 10:49:19.042 Photo transfer settings: source libraries = /Volumes/Pictures/iPhoto Library, copy faces = true, copy places = true, combine album contents = false, photo attributes copied = (comment, date, flagged, hidden, latitude, longitude, name, rating)
2015-01-21 10:49:19.042 Loading data for library /Volumes/Pictures/iPhoto Library…
2015-01-21 10:49:19.056 Version number: 9.6
2015-01-21 10:49:19.057 An error occurred: Trying to load database for library “/Volumes/Pictures/iPhoto Library” failed. Some information such as faces, places, and edit history may not be transferred succesfully. (error = Error Domain=PLDatabaseErrorDomain Code=1 "The SQLite database file could not be found." UserInfo=0x10e9c1c10 {PLDatabaseErrorVendorErrorKey=14, PLDatabaseErrorVendorStringKey=unable to open database file, NSLocalizedDescription=The SQLite database file could not be found.}
After this each entry has a dialog that basically says the image file is missing from /Volumes/Pictures/iPhoto Library.
As mentioned in an earlier post I do have another iPhoto Library on my 2008 MacBook.
Can someone advise the best way to proceed? I'm thinking that I should erase the partition of my external hard drive that is called Pictures and then connect the external hard drive to my 2008 MacBook and simply drag and drop the iPhoto Library to the Pictures partition. IIRC, that's the way I moved the iPhoto Library last October when I bought my new MacBook Pro which didn't have enough storage for me to be able to store my iPhoto Library on the MBP. I could then reconnect the external hard drive to my MBP and the iPhoto Library should reappear, shouldn't it?
Looking forward to more input ...
Tricia

External Hard drive will no longer mount

I just got a new macbook pro refurbished, and I connected my external hard drive to it and it worked great the first time. I came back to do that same today and now i cannot get any hard drives to show up on my computer in the desktop, then checked disk utility. My setting are set for them to show up on my desktop as well. I have two drives and neither will show up. But both will show up on my older MacBook Pro. I just cannot understand how it would work one day and then not the next. If it was a system issue I would assume it would have not worked the first day. Help!

Nevermind, I updated the system and works like a charm, so weird.

External hard drive will no longer will mount.....

I have a mac-mini OS 10.5.4 and a Hitachi-SimpleTec 500GB HD. Has been working beautifully and now, the icon for this volume is just (poof)...gone from the desktop and will no longer mount.
Here's the kicker. Went to Disk Utility>First Aid and the HITACHI HD shows up in the list to the left. Y'know, there's that first tier that says "465.8 GB HITACHI HD..." And then, just underneath (of course) there's an indention and the personal name of what I call my drive...(AND THAT IS ACTUALLY GRAYED-OUT)
But anyway, I still proceed to go through the "First Aid" process.....
"Verify Disk" which it says, "The volume (blah, blah)...appears to be OK.
(NEXT).....
"Repair Disk" (same thing) The volume (blah, blah)...appears to be OK.
But, it absolutely will not mount!
Now, what I have also tried is to "right-click" on my hard drive icon (still right there in the left column of "Disk Utilities"). And it gives me the option to, both..."Mount" or "Eject" the drive. Well, I've tried both! (lol) And I get the following error messages (each time)
Mount = "The Disk (my name, blah, blah)..could not be mounted. Try running First Aid on the disk and then retry mounting" (Of course, I've done the First Aid and it all said "OK"
(SO THEN I TRIED)....
"Eject" which said, "The Disk (my name, blah, blah)..could not be UN-mounted.
Make sure all applications and files are closed on this disk" (what could be "open" on this disk that won't mount in the first place?)
Okay, guys! VERY, OVERLY DESCRIPTIVE I KNOW....BUT, I'm desperate! I WANT to finish my mix I was working on and need my music. My system has been shut-down/restarted...(all that stuff). I hope I haven't left anything out! (lol) I HOPE, EVEN MORE SO that it's something relatively simple as well.
Many...many THANKS!
peace.

Yes. Thanks for the response. I followed all the steps you gave a little bit ago. And still, the Drive comes on, the led light flashes once. I can here it kick on. But, the usual icon for it is still not in finder, not on the desktop. But, of course it shows up in disk utility. Again, the first line that says, "465.8 Hitachi HD...." And that second line which says, "deejayWESTBROOK LIBRARY 1" is grayed-out (but I can still click on it....still won't mount...(or eject). But, it still gives info about the drive:
Name : deejayWESTBROOK LIBRARY 1
Type : Volume
Disk Identifier : disk1s1
Mount Point : Not mounted
File System : Mac OS Extended (Journaled)
Connection Bus: USB
Device Tree : /PCI0@0/USB7@1D,7/@5:1
Writable : Yes
Capacity : 465.8 GB (500,107,829,248 Bytes)
Owners Enabled : No
Can Turn Owners Off : Yes
Can Be Formatted : Yes
Bootable : Yes
Supports Journaling : Yes
Journaled : No
Disk Number : 1
Partition Number : 1
And lastly, both "repair" and "verifiy" say that the drive is "OK"
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External hard drive will no longer mount or be recognized by any utility FIX!!!

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Nevermind, I updated the system and works like a charm, so weird.

I am running my first backup on Time Machine using a Seagate external hard drive with a thunderbolt adapter and cable. I have a MacBook Pro 2011. It is backing up 11GB, and is telling me it will take approx two days. Is this normal?

I am running my first backup on Time Machine using a Seagate external hard drive with a thunderbolt adapter and cable. I have a MacBook Pro 2011. It is backing up 11GB, and is telling me it will take approx two days. Is this normal?

Download the supplemental fix to 10.7.5
http://support.apple.com/kb/DL1599

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Once I upgraded to ML, I'm now finding that my Seagate Free Agent external hard drive is no longer being backed up by Time machine. Do I have to wait for Seagate to update their drivers for this hard drive?

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I have a seagate external hard drive with files transferred from my windows pc. If I will download NTFS Driver from seagate to my mac, could I install it safely without harming my files? I am afraid.. I might erase all my important files during the installation..

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Mixing files with data is not always great idea.
See info here.
Q3 http://pondini.org/TM/Time_Capsule.html
Why not just connect the PC directly to the TC by ethernet and copy the files over?
It is hugely faster and much less mucking around.
In windows load the airport utility for windows.. if you have not already as this will help you access the drive.
There is more info here.
http://support.apple.com/kb/HT1331

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Im new to Mac and I was doing fine with my new laptop but somewhere along the way I have reach to a point where I cant continue my work. I am having trouble on transferring photos from iPhotos to my Seagate External Hard Drive, even when the hard drive is compatable with my MacBook Air. Some how I have trouble trying to drag my photos to my drive and it is not letting me to do so. Pls. help me in my sistuation or derect me to a website that will answer my questions. I am getting really upset and frustrated; so I'm out of ideas.

even when the hard drive is compatable with my MacBook Air.
What is the file system on that drive? Is it formatted MacOS Extended (Journaled)?
And what is your iPhoto version? iPhoto 9.5.1?
Some how I have trouble trying to drag my photos to my drive and it is not letting me to do so
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Can you export your photos, when you select the photos on iPhoto and use the command "File > Export"?

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This is very confusing. I can still copy and move files but I have to give my password every single time.
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My seagate external hard drive will no longer start up

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