Hey everyone, Long time reader, first time poster. I have a Late 2009 27" iMac (2.8GHz i7/Radeon HD4850) that chimes but won't go any farther than that. When you press the power button it will bong, the fans will ramp up to their highest setting and then nothing comes up on the screen but it doesn't seem like it's booting and just not displaying either. Tried a PRAM and SMC reset and while the computer did respond to those commands it didn't change anything. Also tried swapping the RAM but made no difference. I'm not getting any lights on the keyboard either. Any ideas?