Hi, this is my first post here, so I hope I'm in the right place (right website, right forum) for what I need. I have an imac that's been having trouble powering on. It powers on fine if it has only been just briefly shut off, but if it is off for any length of time it has problems. It will rev and the l.e.d. light will flash, but it has trouble "catching". Sometimes, if I work and work at it, it will finally catch and power up. But not this time! Right now it's been black screen for over two weeks! Currently, I am not always able to get any noise or light. I tried readjusting the internal power button, which did look out of alignment, but that did nothing. Any ideas?