Ok. Since the Laptop Was Dropped. We Need To Check And See If The Hard Drive Was Knocked Loose From Its Tray. Whats The Exact Model Number Of Your Laptop. We Have Acer Aspire 5334 There Should Be Four Other Numbers. Most Likely Your Hard Drive Was Knocked Loose And The Laptop Cant Find It.
On The Bottom Of The Laptop There Is This Cover. Big And Long. Take A Screwdriver And Remove That Cover. Take A Look Inside And See If The Hard Drive Is Knocked Loose.
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If It Did. Just Slide The Hard Drive Back Into The Connector.
Let me Know What Happens :)