I have a Dell Inspiron 620 desktop. I was working on iTunes when the computer froze. I couldn't get it to do anything. I ended the itunes process in task manager. Everything still froze. I turned the computer off for a bit. Turned it back on and all that came up was a black screen with a solid white dash in the upper left corner. The fans are running, sounds like it is working, but nothing. No disk in the CD will come up on screen. It just remains black. I have unplugged everything but mouse and keyboard and no USB plugged in. The white dash or underscore does not flash. There are no beeps. Is this a bad hard drive problem? Oh, I tried another monitor and the same screen comes up: black with that solid white dash at the top.