Hi, I'm new here and I could use some help. My Brother-in-law gave me his A1224 iMac desktop. When I first received it, there was no power, no lights, no nothing. I assumed that since there is no power, it's probably the power supply. I replaced it and now I have the first three LED's lit, but the fourth is dark. I have the cooling fans running and some hard drive noise, but no boot sounds or display. I've seen several postings that say it's either the LCD or the Logic Board. I don't want to keep replacing till I hit it right. Logically, I'm leaning to the logic board, since if it was just the LCD, wouldn't I still hear the OS boot sounds? I could by a mini dvi to VGA adapter to test the LCD. However, I'm looking for some ideas before I keep pouring money into this. I appreciate any and all suggestions !