We can't do much with that statement.
What system model?
What version of Windows?
Have you reloaded WIndows recently?
Have you run a hard drive diagnostic?
Have you verified the power and data connections to the hard drive?
@vvalecha, like ejn63 said, you need to provide us with more information regarding the issue that you have. When you have time, answer the questions above.
Anyway, you try something and let's see what will happen. Please, go to the BIOS while starting your laptop and navigate to the Boot menu. There, you must check whether the hard drive is set to the first place in the boot priority. If it's not, please adjust it. Then press the respective F key to save the settings and restart the laptop.
Please, let me know what happened. Cheers.
"Stop error code 0x0000007B (INACCESSIBLE_BOOT_DEVICE)" is not the same as boot device not found please install an operating system on your hard disk.
BIOS Error from HP computer. Please refer to this thread for possible cause of the failure.