When I turn on my Dell Inspiron 15 3000 Series, I get is a message that says insert installation disc, which I dont have and at the bottom of the screen it says the boot selection failed because a required device is inaccessable. Can someone please help.
Are you able to hear the hard drive spinning? If you can, then my suggestion is to enter the BIOS next time when you start the laptop and to go to the Boot menu. There, you should be able to find the hard drive in the list of devices to boot from. Are you able to find the HDD? If so, select it as a first boot priority device. Then save and exit the BIOS in order to continue with the starting process.
If you can't see the HDD it's because it has probably failed and need replacement.