Change BIOS Settings:

To Access the BIOS settings you need to hold DEL key when you start up your computer (or whatever key your BIOS tells you to enter setup), 

Now Change the Boot first option to Hard disk(HDD) By default it will be HDD but if you have ever installed windows, then you might have changed it to CD or Removable disk. So go to BIOS settings and change it to HDD again.

What this will do is it will turn off the tests your computer runs when it first turns on, and the boot priority tweak will tell your computer not to look for CDs, thumb drives, or other media when it first starts, which will get you booted into your OS quicker.