My MacBook is showing a white screen I tried to hold command button and R but nothing is working what should I do

I suggest starting with the following two articles. Please post back your results or if you require additional assistance with this matter.

• If your Mac doesn't turn on - Apple Support
• If your Mac doesn't start up all the way - Apple Support

If it's showing a white screen, it's on.

Have you had a chance to review both articles I provided you with links to? ... and, if so, what were your results?