Hi ibssolutions, I'm not sure whether you've tried setting up your account on another computer. It will help to narrow down if the issue is related to your computer or Office 365 account.
In addition, when you configure Office 365 account on the Outlook client. The Autodiscover service will help you configure the account automatically. There is no need to set up manually. As the issue persists since you upgraded the motherboard and cpu, I'm afraid that there are something wrong with the system. If the account can be configured on another computer successfully. The issue should be caused by the system.
In addition, when you configure Office 365 account on the Outlook client. The Autodiscover service will help you configure the account automatically. There is no need to set up manually. As the issue persists since you upgraded the motherboard and cpu, I'm afraid that there are something wrong with the system. If the account can be configured on another computer successfully. The issue should be caused by the system.