The Display of my iMac (Mid2011) does not turn on, after booting

Thank you BGreg,

this kind of helped, because now it works, i did a SMC reset, Paramater Ram clear, and couple of reboots...

now the display works, but i am not sure if it stays that way, because it went dark before just during normal operation, so i cant tell if its going to do the same again.

if it happens again i guess i need to visit a service center.

cheers

amigo500

hi again,

another question popped into my mind, since the display is working now, can i perform something like a system check ? maybe something gets diagnosed and i can work from there...

thanks again

thank again BGreg i will do that.

Also, the display went dark again and i redid the SMC reset.

I believe that i only just now did the SMC reset correctly, because i counted from 1 to 5 while holding the power button to get the exact amount of time, after that the display looked absolutly normal while booting lighting up right away in bright white, and its still working. i believe it really has to be exactly 5 seconds.

i will do the hardware check to rule out any further issues.

cheers

hi again,

i did both hardware tests, short and long, no problems have been detected.

but it happened againg, the screen just stayed dark... then i played around and did the smc reset again, and rebooted alot, and suddenly it worked again and now i am using the imac to write this post...

do you have any idea what i could try next ?

maybe i could update to mountain lion ?

Message was edited by: Amigo500

Thank you Greg,

Right now the screen is dark again after i tried to reboot...

and now its working again, i have really no idea what i am doing, it seems absolutely random, i will try the update now, thx again

i reinstalled 10.6.8, can i somehow check that this went through correctly, like an update protocoll ? because all i can see is taht is 10.6.8, which it was before too..

i also found some wrong permissions that needed to be repaired one of them looked like this:

Abweichende Zugriffsrechte für „System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Su pport/LockScreen.app/Contents/Resources/English.lproj/MainMenu.nib“, Soll-Wert: drwxr-xr-x , Ist-Wert: -rwxr-xr-x .

ive never heard of the lockscreen.app maybe this has something to do with my problems ?

also, could it be a virus ? i know os virus programs are very rare, but are the a possible threat ?

thanks again guys

I did not see the installer message after rebooting, because the screen went dark again, i gave it some time to finish, like 30mins or so, and then rebooted, and everything seems to look normal update wise.

Regarding the display problem, i dont know, it works now, could be randomly ok again though...

It also went to energy saving mode,because i was afk for a while, it was black (as it should) and when i pressed a button it immediatly went bright, so this seems to work too...

I guess i have to try a few reboots to see if its really working now...

The problem still persists, but it is extremly random. Sometimes i can even go into screensaver mode and out of it and the display reacts fine. But sometimes the display just goes dark, and stays dark. When i try to reboot it works most of the time. ( I try to do a SMC reset everytime i reboot)

I also have win7 installed using bootcamp drivers, just fyi...

Anything else i can try ?