I replaced the dvd drive on a compaq presario, which required removing the keyboard. I thought I was quite gentle with it, but apparently not enough, because now the keyboard keys have to be pushed twice or harder than before to register as a pressed key. The problem is getting to be very annoying.
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The motherboard of your laptop might have encountered a short circuit. If you've already removed and reseated all possible removable parts and still get the same result, purchase a replacement motherboard or check if it is still under warranty.
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.