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There may be one available as a block diagramme for a fee on a web site somewhere but that is not common.
Most manufacturer trained computer engineers know how motherboards work alongside the firmware and chosen software so there is no call for them.
Remove the battery and power source. Remove the RAM and hdd. Power up with the power supply and it should do something. If it does, replace the RAM and hdd it should now restart. If nothing, check the GPU.
I am assuming you are discussing the 2002 Pontiac Aztec, the early crossover with the rather distinctive look. I would assume that since they were made by the same manufacturer and they used the same parts that their computers should be compatible. I can't say so for certain as you haven't provided much information, but, unless one of the Aztec owner swapped out the original computer and replaced it with an updated device, the computers should be compatible.
If you are thinking of trying to swap computer chips, I would advise you to wait and let a professional do it at an independent shop. The reason I suggest this is simple, unless you know how to access the computer chip correctly, you risk accidentally ruining it. If you handle the replacement chip incorrectly it is entirely possible that for a stray static charge to ruin the chip by blowing out a trace. Also, if you damaged the socket from which the original chip was removed then it is possible that you will not be able to reinsert the new device without bending any leads on the bottom. If the leads are damaged, then the new computer won't work.
Even if the new computer chip and the original chip were already installed in installable cases (the way most desktop computer chips are installed), it is possible that when you removed the computer, you might have damaged the receiving socket which means that when you go to insert the new computer carrier it won't work correctly because a few or many of the pins on the bottom of the board won't sit correctly.
Your Model of Aspire has a different battery release method, see attached pic on how to do it. This is a pic from your User Manual, you can download it from here Download Acer Aspire E1 572
Manual. I suspect that the information you have been given regarding battery removal and passwords refers to removing the cmos battery as in a PC in the hope that it will clear Bios activated passwords.
It sounds like it could be either the battery is going bad and not holding a charge or the adapter is. I have had really good luck with similar problems going to places like Batteries +, and large electronic retailers, and my favorite the small local mom and pop computer store; where I end up asking them If I could try one of the adapters from the floor model to eliminate if is a faulty adapter. Other then that I'd if its not out of warranty contact Acers online chat support at http://us.acer.com/ac/en/US/content/service
Try the following: Using your FN key and the F7 Key together it might work again. You could have toggled the touchpad off. If that does not work you have issues with either the touchpad or the operating system. Best of Luck.