My hard drive has stopped working! I checked power supply and it is working fine, when plugged into drive and turned on, the blue light flashes briefly on the drive then goes off again as does the light on the transformer on the power supply. when power supply is not connected to the drive the green light stays on like usual. it does this wen both plugged into the usb port and not. please help!

Your hard drive is not getting the power from the port u r connecting to. So please check it with other port . If the same behaviour then it is physically damaged and u have to take it to the service centre

Hello.
I have had simular problems with one of these. It can be due to the drive not starting up or shutting down properly or a powers issue.
I woud recomend dissconecting all leads from the back of the hard drive.
Now plug in just the mains power. Now turn the drive on and let it boot up until the light stops flashing. Let it stay constant for a while, now press the power/led button to let it shut down properly on it's own.
Now turn of your mac. with the hard drive still OFF, connect the fire wire to you're mac and HD. Now power up the Mac. If the HD does not power up on it's own, turn it on now.
Hopefully all should be ok now.
If not, try to test it on a PC. It may sound strange, but it can make a difference. Now do all the above again.
Any Luck?
Ok another thing is to try a psu. Hopefully you know someone with a drive you can ask to test their power supply with.. Try all of the above things again? Any joy? if it all workd ok with their power supply and not your's, your mains transformer is bust. It's caused by a capcitor that blows (quite common). If your drive is recent, you may be able to harrass Lacie for a new one, if not I managed to get a Lacie psu from ebay for around £25.00+p&p on ebay.
A final thing to check is what firewire version your mac is against the firwire version of the lacie. Sometimes this can give issues.
Hope this helps.

In my case it turned out to be a weak power supply. It would work sometimes and not others. If stone cold, it would not boot. If I unplugged 1 thing, like the hard drive or the CD Roms, it would boot. Tested the old power suppy and it seemed to pass. But once I connected a new power supply, the computer has worked fine ever since.

have you checked the output on the power adapter when you plugged in? if not, there is no hard reset for the drive. you just have to isolate the board on you external hdd.

Have you tried a differnt usb cable if that dos not do it get back with me and I will walk you though checking it out

First check your usb port of computer and usb csable are working fine.
Then go to my computer proeprty then hardware then device manager then uninstall all usb drivers then restart the computer then check

I had the same problem. I fixed this by leaving the power supply connected with the wall socket for about 15 minutes, without connecting it to the external hdd. After that I connected the power supply with the external hdd and it worked perfectly. I hope this helps for you too!  

sounds like you are using the wrong power supply. Check the amp output on the power plug you plug into the wall make sure its the same as the amp input of your external harddrive

The power circuits in the external hard drive enclosure may have burnt out or the fuse may have blown. Its unlikely your hard-disk is itself damaged.
You may remove the actual hard-disk from the enclosure and put it in another and access the data.
All the best!

how do I fix my external hard drive, because one day I turned it on and the drive was fine, the next day when I turned it on, it kept on flashing blue, does that mean that the drive is dead. Please help me with this.