Hello Steve,
We still can't identify the possible causes of this white screen issue during startup. For us to isolate and assist you better with this issue, kindly answer the following questions:
- Have you made any recent changes to your computer prior to the issue?
- Have you tried removing any external plugged in devices (except mouse, keyboard, and internet connection) before rebooting? If you still haven't, you may give that a try and check if issue persist.
- What other troubleshooting steps have you tried so far?
We look forward to your reply.