A have a white screen how to make a new installation of my computer

A have a white screen how to make a new installation of my computer

More details would help...what have you done to get to a white screen?  Were you in the process of reinstalling Mac OS X?  Or something else?
In general, to reinstall Mac OS X, restart the Mac and hold the Command and R keys.  From the Utilities drop down select Install Mac OS X and the system will download the installer.  You w I'll then follow the instructions to install.
By the way, you posted in the iMac PPC forum, this belongs in Yosemite from what you show on your info line, I will ask for relocation.

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