apologies if ive done something wrong in creating a new thread its just its a slightly different question to my previous old thread about my imac. took my 2011 imac in because the screen flickers. it started being rare, once a week, then within 6 weeks it was the screen flickering every 5 mins, and often on startup too. basically the screen goes black for about half a second, as if your just moved the mouse as your screen saver kicked in, or someone logged in using teamviewer (its a longer flicker than that though). it does it mainly in light safari use, also playing starcraft, using indesign. strangely it doesnt do it in bootcamp or not that i noticed. before taking it to apple i wiped the hard drive, reinstalled from scratch, didnt copy anything from my backup, so fresh apple system. light use, starts happening within 5 minutes. doesnt seem to happen when im not doing anything, and gets worse when ive been using it for a couple of hours. took it into worten who are the local apple supplier. they confirmed with apple that they'd fix it if it was the graphics card as theres a nown problem, but they had my machine for 4 days and couldnt get it to flicker once. paid them to give it a good clean, they thought maybe a cable had been loose inside as they'd opened it and unplugged and replugged everything. went and took it back, took it home, plugged in, it started up. opened safari and looked at some web sites including this one, flickering within 5 minutes. unplugged it just in case its the socket, and moved it to another socket in the flat, i dont think i have any problems with sockets or cabling anyway, its not an old flat, but this socket i know is fine as its a light normally plugged into it and it doesnt flicker. didnt use any extention cable. within 5 minutes it was flickering. now i can take it back to worten, the guy said as i was leaving if there were any problems he already had authorisation from apple, but if it doesnt flicker there what could be different?