OK, wow, that was the dustiest machine I've ever cleaned!
Part of the cleaning included removing the graphics card for thorough cleaning, and check of contact cleanliness.
When I plug in the AC cord, a green led lights in the center of the motherboard. The main cooling fan kicks on (as if for a system check), as does the fan on the graphics card. I also see the LEDs on the keyboard light for a moment.
I tried unplugging the 115v cord, waiting for the led to go off, and plugged in again, and noticed one short 'beep' (probably did it the first time too, just missed it).
When I push the 'on' button, the fans (Main, PS, graphics card) all come on, and the "gentle buzzer" sound (I believe is a 60 cycle) seems to be coming from the Power Supply. Perhaps as if it's trying to do something, but failing.
The lights on the front panel:
Both CD/DVD drives light for a moment
Below those, digits "3" and "4" light and stay lit.
Just above those digits, something which resembles a graphic of a cylinder lights, then goes out.
When I turn the computer off, I can hear at least one of the Hard drives wind down.
I then removed the CMOS battery from the MB, and let rest 4-5 minutes, then replaced.
I should mention the monitor comes on with the Dell logo, then displays an auto detect / analog input, and gos into power save mode.
At rest (turned off, but plugged in, the green led on the MB stays lit...
Edited by Goldenvoice, 11 November 2010 - 12:14 PM.