That wouldn't be a computer problem , maybe be the ignition switch . If you don't know how to test automotive electrical circuits , viewing wiring diagrams an using a DVOM - digital volt ohmmeter your best bet , have a qualified repair shop check it out . More then likely just a electrical connection problem , Voltage drop testing on main power circuit's is what needs to be done.
Free wiring diagrams here
http://www.bbbind.com/free-tsb/ Enter vehicle info. year , make , model an engine . Under system click on electrical distribution , then under subsystem click on power distribution . Click the search button then the blue link. Start at the beginning testing battery connections , cables . Power supply to the fuse boxes ,to the ignition switch , an from the ignition switch. There is battery voltage to the ignition switch ,hooking up a test light or voltmeter to that main battery power feed an turning the key to run start etc... does the light go out or stay bright ?
Check out put from the ignition switch , start , run circuit's
https://www.youtube.com/watch?v=SO-eKuhCOqc
https://www.youtube.com/watch?v=efKoWifdcag
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