I am unable to get two external LaCie drives to mount.  I switched computer desks and everything was disconnected for a few days.  My 2T g drive mounted with no trouble.  What can I do to mount the two LaCie drives?  One is a 4T, the other is 1T.

After disconnected all the computer peripherals and trading computer desks, today I can't get the two LaCie external drives to mount.  They were working yesterday, but not without problems.  The 1T is hooked up for Time Machine, and it ran continually yesterday.  Today it isn't mounting.  The 4T showed on my mac desktop, but an error message stated it wouldn't mount.  I'm not super computer savvy and really need some help.  Also, the 2T g-drive is working without any problems.  My iMac is an older 2008 24" aluminum model.  It has been working well, but gets very hot in back.   What should I try now?

How have you been connecting these drives to your iMac?  USB?
Have you connected them back to your iMac the same way they were connected before?  Including making sure they have the power they need?
If all the connections are just as before, and all the drives have the power they need, have you tried shutting down your iMac and starting it up from a cold start?
If you still have trouble I would ask whether you shut everything down correctly before disconnecting/unplugging/powering-down the drives.  Unfortunately, it is possible that some of the drives were not disconnected or whatever in the proper manner, and, so, have become corrupted.  (I'm hoping not, for your sake.  However, even if so, such can be recovered, but it will take more expertise than you seem to claim for yourself.)

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