I have a brand new computer (window 11 home). I downloaded the Turbotax 2024 and ran it. Splash screen popped up and disappeared right away. Anyone have the solution?

Did it at least download?  Is your computer in S mode?  You might need to switch out of S mode.  See this Windows FAQ.  The second item is how to switch out.

Windows 10 and Windows 11 in S mode FAQ - Microsoft Support

Troubleshooting Desktop for Windows windows

https://ttlc.intuit.com/turbotax-support/en-us/help-article/product-delivery/troubleshoot-turbotax-windows-downloading-issues/L6YvjRnaC_US_en_US

No. My new window 11 is not run under s mod.  I removed my AVG antivirus and disabled the window defender.  Downloaded the turbo tax and installed fine.  When it ran, the splash screen pop up and nothing happened after.  My computer is Dell XPS 8960. From my research, looked like it could not connect to the TurboTax site for activation step.  Please help.

It's not this is it?  Looping back to sign on screen when try to activate program
https://ttlc.intuit.com/turbotax-support/en-us/help-article/new-subscriptions/seeing-sign-screen-attempting-sign-activation-2024/L3lDupVPS_US_en_US?uid=m60c1z9w

After I run the TurboTax, i only saw the splash screen. I did not see the page where I should ask for my activation code.  The program just quit.