Replacing Logic Board

I have an Indigo 350 mHz from Summer 2000 in which the screen will no longer come on. I get a green power button but no chimes. I have looked through the other discussions and have replaced the battery and reset the PMU, all to no avail. I am now under the assumption that I must replace the logic board. My question (at last) is how critical is it that I replace it the exact same logic board (part # and all). I see many varieties available on ebay, including some with the same part number. Is there any reason I couldn't do a slight upgrade, or am I asking for trouble. Thanks.

Brent,
I concour with Henry too many things can generate your problem MotherBoard, Down Converter, or even a fuse.
If you would like to troubleshoot your problem is better that you download Apple service Manual or check this other web site.
Regarding replacing Motherboard, is some how critical. A research in this discussion may help you.
You may find that motherboard and Slot-loading iMac are some how interchangable (I HAVE NOT TRIED YET). Post #1 but, I also remember that there are something about incompatibility between Down converter and mother boards.
I you have not time to experiment a replacement part# for Part # is the easy way to go..
Hope this help,
Mauro

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