The vertical lines mean that there could be an issue with your graphics processor, they sometimes comes loose when they overheat . would assume somebody has to open the Laptop and re-flow or replace your logic boardt. If you want to pay to have somebody do it for you there is a third party HP Repair Service. However, if you want to do it yourself, the part is available on ebay. Here's an HP Repair guide. Maybe a tech savy friend can do it for you.
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It sounds like you may possibly have two problems here. (1) have your recently dropped your laptop or had a shock to the screen? (2) Do you hear any disk activity? Do you have indexing on or some type of scanning software? Can you use the machine otherwise with the drive light glowing?
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