Hi guys, if have also a 2009 iMac A1311 EMC 2308. Its not powering up. (1) diagnose led 1 is on (2) 12V on pin 4 is present (3) after pressing power button, 12V is present on pin 11 but diagnose led 2 stays off! (4) power on request signal (pin 12) has 0V after pressing the button, arround 4V before pressing it In the manual it says its probably the PSU. But I thought the power on request signal comes from the logic board?! Does anybody has an idea? Thx in advance! Greetings from germany, Ruben