White Screen in startup

I was normaly playing in black mesa, but i close it for a while for updating Directx, so when i enter again to black mesa appears a white screen!
Help!

Reboot your PC, run the DirectX redist installation once again, then reboot your PC one more time and try runing BM.

In case the problem persist - report back with the screenshot illustrating the problem and specs of the hardware and software you have in your PC.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.