black screen after waking from sleep

have a 2009 Intel-based iMac that wake properly from sleep if more than 30 minutes. It is a screen 24 '', 5 GB RAM and processor Core 2 Duo 3.06 GHz, 256 GB SSD drive and was just upgraded to El Capitan at the start of this behavior. The extra RAM and SSD have been installed a few days before the upgrade of El Caitan, so am not sure that the upgrade of the OS was the culprit, but it seemed to work normally after the SSD and RAM have been added. After that the computer sleep long enough to power down disks, etc., the screen remains dark when the computer wakes. If you put it to sleep then it wake up immediately he returns normally without problems. You can hear the startup sound and can even connect and enter the password and hear the mail and other programs that are running, giving their notification sounds, etc.. However, the screen remains dark. If you restart it 10 or 15 times the screen will start normally and the computer works perfectly. diagnosis seems to indicate normal operation. I tried to reset the SMC and the NVRAM and start in safe mode, but these things have no effect. Is it possible to get help with this?

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I run Apple Hardware Test and found no hardware problem under standard test or extended. I ran the first aid on the SSD, but no permissions problem have been found. It is not as if I have a hardware problem, but a problem of software not defined.

Tags: Mac

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