Turns off instead of going to sleep

I've normally put my mac pro to sleep and was able to easily turn it on by pressing any key on the keyboard. Unfortunately that no longer happens. When I put the computer to sleep it simply turns off. I can only turn it on by pressing the power button and when it does turn on, I lose all the open windows and programs I had opened. Hence losing unsaved work, if I didn't save previously. How may I be able to fix this issue.
The things I have tried are, SMC reset and PRAM reset.

Turn off the computer, remove the battery and the A/C power adapter. Press and hold the power button for 10 seconds (yes, a full 10 seconds). Put the battery back in and plug the A/C power back in. Then press the power button and quickly hold down: Option + Apple (Command) + P + R all at the same time (don't hold power). Keep holding until you heard 2 startup chimes.
After that give that a test. Let me know how it goes.

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First Magus wrote:
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Turns off instead of going to sleep

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