Macbook Pro 2009 and Dell monitor U2412Mb

Hi All,
I've had my MacBook Pro and my Dell monitor working perfectly well for over a year.  I did the latest OS software update and POW Mac won't recongise my sreeen.  I've looked for a new driver to no avial.  Can anyone help me to get them talking again?
Rhoda123

Hi Rhoda123!
It sounds like you may need to reset a part of your system that deals with your video card, and this is commonly known as PRAM. We have an article that talks about the functioning of this part of your computer and how to reset it, which can be found here:
About NVRAM and PRAM
http://support.apple.com/kb/ht1379
Specifically, this section will probably be the most relevant to resolving your issue:
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
After resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, and time zone information. If issues persist, your Mac's logic board battery (not a portable Mac's rechargeable battery) may need to be replaced. The logic board battery helps retain NVRAM/PRAM settings when your computer is shut down. You can take your Mac to a Mac Genius or Apple Authorized Service Provider to replace the battery on the logic board.
Thanks for coming to the Apple Support Communities!
Regards,
Braden

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