Hi Nkprl,
Welcome to Sony Community!
We're sad to hear that replacing the motherboard didn't fix the issue. If you're not familiar with the process, you should get some help from experienced people, Sony service center or a trustworthy computer repair service in your area. Please be warned that doing something wrong with your unit could seriously damage your system.
We highly recommend visiting our Sony Global Web site for information on contacting the Sony Support Center in your region at http://www.sony.net/SonyInfo/Support/ to assist you with this issue.
Regards,
Jen
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