Computer went into sleep mode and will not wake up!

I have a HP Pavilion a350n which I love and have never had a problem with it.....until now.
When I turn it on I get a black screen with a small window that reads "Warning" "PC entering power saving mode"  Then the screen goes blank and the blue power light on the monitor turns an amber color.  The only way I can turn off the computer is with the blue power button on the front of the tower.
Every "fix" I have come across says to do a System Restore from the Start Menu....How do you get to the start menu when you can't wake up the computer!
I have tried disconnecting the main power cord from the outlet and reconnecting it and turning the computer back on.  Nothing but the same "Warning....."
I tied hitting the F1 button at turning on the unit and nothing......
I checked the monitor connection at the rear of the computer and can't see any bent or broken pins.  Cord looks great too.
I took the back off and was going to try and unseat the memory card and reseat it again, but I don't know much about the inside of a computer and am not sure where the memory card is or what the hec it even looks like!
Thanks for any help!

First try another monitor. What type and model of monitor do you have now?
If the computer turns off also, it could be shutting down due to hardware issues. Open the case and clean out the dust and then pull the video card and memory and reseat them. Then try to boot up.

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    Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
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