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The hard drive may have dislodged from the HD terminal. Some early laptops didn't reinforce the connection here. There is a bay under the laptop with a HDD or O)) symbol that opens with a small Phillips screwdriver. There should only be 2-4 screws on the bay panel. Open the bay. The hard drive should be firmly connected to the computer. Make sure the connection is good, then replace the bay cover and screws.
Start up the computer...Update the post on your outcome.
Have you tried to connect your laptop to external monitor?
If you get normal picture on external monitor, then you need to replace LCD screen, but if you get same picture on external screen, then unfortunately you will need new motherboard, because graphics card is integrated to motherboard.
Try hooking up an external monitor to the video adapter on your laptop. If the screen appears fine (no blue line) then your video card is good but you laptop's LCD monitor is bad. I would check eBay for a replacement. They are not too difficult to replace if you are somewhat mechanically inclined (can unscrew some screws and disconnect a wire plugged in the motherboard).