Boot-up Disk Choice in in Yosemite Style (black background) instead of white

I have a MacBook Pro Retina 15" Late 2013 currently running OS X Mavericks.
Yesterday I installed OS X Yosemite on a partition of my external HDD to try it out, and everything went smoothly.
After a while I rebooted Mavericks and deleted the partition containing Yosemite.
The problem now is that when I boot pressing the "option" key I still get the Yosemite style window with the bootable disks on a black background instead of the usual white of Mavericks.
I don't know what this means and how in can be possible, since I deleted the whole partition that was on an external HDD.
Thanks for the help

HI,
There are no known Mac viruses.
Try booting from your install disk and run Disk Utility.
Insert Installer disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu (Panther and earlier) or Utilities menu (Tiger and later) and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
When you are finished with DU, from the Menu Bar, select Utilities/Startup Manager.
Select your start up disk and click Restart
If you can't boot from your install disk, try booting in Safe Mode
Carolyn

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