I removed my optical drive from my ACER laptop and replaced it with a 750 Gb hard drive. When I boot the laptop the light on the hard drive comes on but nothing else happens, no boot screen, no Acer splash screen, no option to press f2 to go to set up - nothing.
So I pulled out the new drive and restarted the laptop. Windows 7 booted normally. Later not realizing that the laptop had hibernated or was sleeping (ie screen was blank) I reinserted the new hard drive and when I touched the keyboard, windows awoke to the login screen. After logging in I could now see my new drive and all the files on it.
Now after restarting, it's back to the same condition as above - no boot screen, nothing.