Hi....any ideas would be great....this is getting annoying.........

I had a 4 gb harddrive running in my computer as the primary master
(I was using it as a backup since my 60 gb crashed). I unplugged the
4 gb because the 60 gb has been fixed, and plugged in the new drive.
I changed the setting in BIOS, and tried to start it up. No luck....it would
boot, and does the very beginning stuff (doesn't try to access the
a:\ drive...which it should), and then just goes to a black screen with
a blinking cursor in the top left. So, i put back in the 4 gig, and reset
the BIOS settings for the harddrive, and get the same thing. What gives?
I keep getting this stupid cursor. I can't get to anything.....Windows, the
floppy disk....nothing! Has anyone had a similar experience?

Thanks!