External hard drive not visible, following Mavericks install

I mac user for 2 years, have a Lacie 2big Thunderbolt external hard drive for my photo catalogue.
Always connected but with the old operating system had to manually switch on and off with blue light button. fine.
Upgraded to Maverick over the weekend, not the lacie drive switches on as soon as the mac powers up, blue light and noise from the drive.
If I have shutdown the mac then when the start up occurs the lacie drive is seen and present in finder, fully functional.
If the mac is switched on from sleep mode the lacie starts up noise and blue light showing, but it is not seen in finder or the disc utility programme.
I then have to switch the drive off, (which it does not like, forced shutdown) and restart manually, then it is seen and works fully,
Have switched off, unplugged, switched thunderbolt ports but no success.
Is there a simple cure for this, setting in sleep mode etc...
Regards Neil

I would start by doing a SMC reset, could take 2-3 attempts. If those do not work then restart in Safe Mode and check and if that does not work try different cables.
SMC reset: Shut down computer remove power cord from computer and wall for 15-20 seconds and restart normally.
Safe Mode: Shut down computer and restart, when you hear the startup tone hold down the Shift key until a progress bar appears. Then restart normally

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