MacBook Pro to Monitor connection

I have a 2011 MacBook Pro and an HP 2511x monitor. I have been able to use them connecting with an HDMI and adapter or a DVI monitor cable and adapter, but when they both go to sleep the monitor will not connect again. Restarting and changing the input output doesn't effect it. Help?

Hello there, ripples in time.
The following Knowledge Base article offers up some great steps for troubleshooting the issue you're describing:
OS X: When your Mac doesn't sleep or wake
http://support.apple.com/kb/TS5357
Particularly of use for you, might be the following section:
Your computer cannot wake from sleep
Make sure your computer isn't powered off by pressing the power key for one second.
If you're using an external display, make sure your display is not powered off or unplugged.
If you are using a Mac notebook:
Make sure the computer's battery is charged. Try connecting the power adapter to the computer, then press the power button for one second to see if the computer powers on.
Make sure the AC power cord is connected securely to the power outlet, and that the outlet it is working correctly. Confirm the power adapter or cable is attached firmly.
If your computer is plugged into a power strip, make sure the power strip is not turned off. Check to make sure other items connected to the power strip are receiving power.
Confirm the right power adapter is connected on Mac notebook computers. If a lower wattage power adapter is used than the one that came with your Mac, it may not provide enough power to charge the battery while the computer is powered on. Make sure there is no debris in the MagSafe port that might prevent charging. When your MagSafe cable is connected properly, you should see a green or orange light on the connector.
If you are using a Mac desktop:
Make sure the AC power cord is connected securely to the computer and outlet.
Make sure the AC power outlet it is connected to is working properly.
If your computer is plugged into a power strip, make sure the power strip is not turned off. Check to make sure other items connected to the power strip are receiving power.
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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