Can you get into the BIOS? Perhaps there is a problem with a setting somewhere. Unplug it from the wall, pop out the CMOS battery and wait a couple minutes, then put it back in and try to boot. That should force it into the setup screen.
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If your equation requires either a complex combination of variables to get the desired result OR you can't seem to get the result regardless of the variables....it ain't your variables, it's your constant.