External hdd and usb issue

Hey there... May sound like a silly question but I am having a problem with an external hdd.
I recently bought a brand-spanking new macbook pro w. retina and can't find my external hdd when I plug it in.
Theoretically, there should be no problem between the old hdd's usb 2 and the new macbook's usb 3, and the new computer is only a week old, so what I was wondering was whether anyone knew if there might be any interface issue between the old hdd (can't remember exactly what the os was - it was either leopard or snow leopard...10.6.something as i recall) and the new one (10.8.3)?
Or should I just go ahead and weep over the old lost hdd?
Appreciate any help

Unreliable wireless performance may occur when USB 3.0 external devices are close

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Message was edited by: NRG1970

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edwardpeck wrote:
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Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
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http://support.apple.com/kb/HT1379
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New2Guitar wrote:
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Message was edited by: ChrisRR

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http://docs.info.apple.com/article.html?artnum=304447
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Hi
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|___________________
Allan

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