Do you get any POST (Power On Self Test) PC speaker beeps? It sounds like your monitor brightness/contrast may be all the way down, or the monitor cable isn't plugged in right (maybe some pins broke off), or possibly the AGP/PCI boot sequence is wrong, or your video card is borked. Try swapping in a new video card, unless it's onboard, in which case you'd have to find a way to disable the onboard one.
Oh, IF your battery died, and you put a new one in, you HAVE to enter your BIOS and re-input all of your settings over again, because all of your old settings got wiped. I highly recommend getting a knowledgable computer person to do this.
You should also try taking expansion cards out of the machine, 1 by 1. Take one out, try to bootup, if it fails, put it back and take out the next card. Same deal with the RAM and IDE devices. A computer guy is also recommended for this.
Hope it works out for you!
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