Lacie External Drive won't turn on (blue Light doesn't go on)

SOURCE: LaCie 500 GB hard Drive - does not register on my desktop

if it is a USB (or you have low disc space), it does take longer to show up on desktop and patience is required... on my iBook it takes over a minute for my Brick to show up... Whether it is USB or firewire, do try another cord (I had similar problem with my lacie firewire external... I used a different firewire cord and all was fine. If you have tried these already, I hope you find the answer... good luck

SOURCE: lacie d2 external drive

I support the comments of (fire sine) I have the d2 120gb Lacie and it was down for two years.  I took it to my apple guys and they said that I needed to go to a data recovery service which would cost a gang of money.  Come to find out, when I decided to update my internal hard drive on my Mac Pro, I had to buy a SATA, IDE, USB 2.0 adapter to back up the internal and transfer to the new internal. Long story short, something said, Hey try and open the Lacie and bypass the board in the enclosure and connect directly to the Western Digital drive inside.  AND WHALA! I got my info, so all I need is a new enclosure.  

SOURCE: Lacie 1TB External Drive flashing blue light, not being found

Hey
I know this arent a solution

Tho I have the same problem atm, this is just a networkstorage device, and this is a newly 1.

SOURCE: My Mac suddenly cannot find my Lacie external

A continuous flashing light on a Lacie drive is a notification of a problem. I do wonder if the light is flashing the same if the drive is plugged in to the Mac or unplugged.

Lacie external drives tend to have power-supplies which become weak/bad. Most users replace the supply and it will work again for awhile until the supply dies again. Try bringing the drive to a retail dealer with Lacie drives -ask them if you can just test your drive with another power-supply (if you do not have another). You can also try calling Lacie, it's always slightly possible they will be aware of this problem.

Alternately, IF the light is only flashing when the drive is plugged-in to the computer, try using a different USB or Firewire cable.

SOURCE: Macintosh computer not recognizing the LaCie external hard drive

First thing to check is whether the Mac recognises the LaCie hardware. Go to the Apple icon, and select 'About this Mac/Computer' then more info, which will launch System Profiler, check the FireWire section under Hardware to see if your drive is listed. Assuming it is, and that the Disk Utility program doesn't see the drive, then you'll need a Disk analysis program like 'Drive Genius' or a recovery program like 'Disk Warrior'
Should your drive not be seen under the FireWire section, you have an interface failure on the LaCie, which isn't terminal, you'll just need to put the drive in another HD case and then read the data. Reply to this and I'll try and give more help depending on the results you get in System Profiler.