MacBook pro will not reboot and seems to be in sleep mode

I have a MacBook Pro and I had a USB side drive hooked to it and shut down.  When I went to reboot after unplugging usb drive, the Laptop seems to be stuck in sleep mode.  The boot up screen does not appear but the light where you open the screen it lit.  It also makes a sound to start booting but it never boots.   The computer was in great running order before this occurred.

Hi mediahero and Welcome
Try this:
Hold the power button down for 10 seconds, wait a further ten then press and release the power button in the usual way.
Good luck
Adrian

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