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The Compaq Presario line is one of the longest-running series of computers, originating in 1993 and remaining in production even after the purchase of Compaq by HP. Because of this, many Compaq Presario desktops have required that some of their parts be upgraded or replaced because of the wear that they have received over years of standard use. One of the more commonly replaced Presario desktop components is the hard drives, especially given how much hard drive storage capacity has increased since the Compaq Presario line was introduced. Replacing a hard drive in a Compaq Presario desktop isn't difficult, and can usually be done in a matter of minutes even for users who aren't familiar with computer upgrades.
Step 1Remove the screws holding the left side panel of the computer on, then slide the panel back to remove it. Set both the panel and the screws aside so that you can put the panel back in place once the hard drive has been replaced.
Step 2Unplug the ATA (wide, flat and usually gray) or SATA (thicker, thin and red) data cable and the power cable from the back of the hard drive that is currently in the Compaq Presario. Move the cables so that they will be out of the way, but make sure that they will still be easily accessible to you so that you can plug them into the new hard drive.
Most likely in this case, the damage is to the hard drive or its connection to the motherboard. The CQ series though has a three point screw attachment for the hard drive so Im more inclined to think that the shock of the landing has damaged the read/write head on the hard drive. If you happen to have another hard drive for a laptop, try installing a new drive and run the installation disc and see if it will complete and boot completely....if it will then the problem was the old drive.
Backup your programs immediately to a thumb drive or external HD. The hard drive may be on the brink of failing. You can replace a hard drive, it's your information thats on it that you may not be able to if it totally crashes!
If your computer will turn on, get to the page where you have the options on how to boot the computer. Slect the option to boot from your hard drive. If it still will not boot up, then you are probably going to just have to repair your OS or do a clean install of your OS.