Everytime when i retrieve my Mac Pro from sleep mode, it doesn't respond,screen goes blank, and on front bottom side white light indicating sleep modes keeps on blinking, I have to press power key turn it off and then start again.

Even some times it starts, but it takes long time.

Hello hmnshgrwl,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
The System Management Controller (SMC) is responsible for many low-level functions on Intel-based Macs.
Best of luck,
Mario

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