Macbook Pro 2011 don't recognize Monitor AOC e224eFw, hence not displaying correct resolution

Two days ago after i put my Macbook Pro 2011 to sleep with the Mini DisplayPort connected (always do the same) stopped identifying my External Monitor, AOC e224eFw showing it as "standard VGA" so i have no the right screen resolutions. I've tried to PRAM reset, SMC reset and not working.
Must say worked 2 days ago. Tried my old trusty Macbook Black 1st Gen and it's working OK with that one.
Any idea why?
Any help will be highly appretiate.
Regards!

I made a mistake, Monitor Model is e2243Fw.
Regards!

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