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Reseating and swapping out the RAM did not work. The screen is still blank. Any thoughts on what to do next? Should I assume a motherboard is to blame?

Thanks. I will try to reseat the RAM and then swap some out. If this is not the problem, then I need to replace the logic board (is that the same as the motherboard?)? I have a feeling that could be extremely expensive...... Thanks again for your help. I'll let you know if it works.

solid, just like if it was running properly.

Update: I just did a reset of the power (which I read on one of the forums here) by unplugging the power cord and holding down the power button while plugging the power cord back in. The startup chime occurred and the fan is now running (it never did before) but won't turn off. Screen is...

There is no light on the monitor. (just like when it is shutdown). It never flashes, blinks, or anything.

I did a pram reset but that did nothing (I heard the initial chime and the one after the reset....still the same problem.) I'm a bit worried because I don't hear the hard drive starting up. Any thoughts on the next troubleshooting step? Some more info... Intel Imac 17" (late 2006 model)...