Screen not refreshing after sleep mode

Hello All,
I have had a problem since 10.7.XX where my screen does not refresh after the computer goes into screen saver mode and then into sleep mode. When I move my mouse to resume i get a line drawn where I move my mouse and it reveals the login screen slowly. I can click on a login account and a small section of the screen refreshes where the login password is. Once I login it goes away. Was hoping Mountail Lion would address, but the problem continues from Snow Leopard. I am on a Imac 24" 2009 3.06Ghz dual core with 4 Gig of Ram, Nvidia GeForce 8800 GS 512mb. Thanks in advance for any advice.
Chad

Hello,
See if it's related to this...
It also seems to be related to later OSX versions, like 10.8.x & 10.9.x
The 2012 macs (and later apparently) (also later OSX versions on earlier Macs can do it also), not waking normally from sleep after hours being in sleep. (noted here ...
http://www.xlr8yourmac.com/archives/feb13/022813.html#2012macswontwake
"Why 2012 iMac/2012 Mac Mini won't Wake After Hours of Sleep (Hibernates/Powers Off)")
The sleepimage file still reappears even if never slept. Delete it (hibernate off, etc) - within minutes its back.
A note on that here - http://www.xlr8yourmac.com/feedback/Chameleon_SSD_Optimizer.html
About iMac sleep...
http://forums.macrumors.com/showthread.php?t=1529750
Try this: "sudo pmset autopoweroff 0" and "sudo pmset standby 0"
http://xlr8yourmac.com/archives/sep13/091313.html#10.8.5SleepEjectTip

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