Hi all. Need some help with my Late 2009 EMC 2308 iMac. It will not turn on, it only displays a grey screen. There is no Apple logo, no flashing folder, I can not boot to an external drive. I have tried resetting the PRAM. Thought it might be the HDD, but after thinking about it I should get a flashing folder and question mark if it was only the hard drive. Anyone else has this issue, what you did to fix it, or any ideas to fix it? Thanks!