IMac 24" (mmid 2007?) Black boot screen, Fans run normal, HDD Spins, Optical drive Spins, no chime and can't find how to fix.

So my girlfriend boss wanted me to fix her computer. So I brought it home turned it on, and it didnt chime but it booted to the gray screen with apple logo/ slashed circle/and folder with a "?" So I made a USB Mac OS x bootable drive (FLASH) held down alt (try using a windows keyboard its fun)  was able to select option and install a fresh copy. all seemed well was running really hot so I poped of the screen. HOLY MOLY! this thing is CAKED with dust, and I am not kidding it has literally piles of dust. So I ran updates, and did firmware updates. Turned it off for the night.
The next morning I went to radio shack and got Dust remove spray, opened it up made sure I was carful taking off the screen, and blew the sucker out. now its NICE and CLEAN. then i made sure I plugged everything in and turned it on. Drive spun like normal, Optical checked for a CD, and fans are also running normally. but no chime, no nothing stays as silent as normal but doesnt budge, it is like it hangs.
Some background knowledge I know next to nothing about Apple, I am Windows based but have been intreged with the new line of Mac Books. anyone help me out?

I figured it out it was the ram. I had took one from my old laptop and its was 6400, and the Mac i have calls for 5300 i went picked some up and wam it turned right on. WOOT!

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