I just found a ibm aptiva e3n that is complete but without any of the packaging or extra things. I opened it up and found that it was very dusty and dis-organized. So I organized all of the components in it but when I plugged it in it didn't boot up or display anything so I went back in and decided to change a few settings on the motherboard and I did but I also had t unplug the cables for the front to unscrew the motherboard completely and when I did put everything back into it I found that it wouldn't power on at all anymore. How can I fix this and what were the default settings for all of the motherboard settings?