Answer to: Input/output error after replacing Hard DriveCould be a defective hard drive, try exchanging it and if all else fails, try a different brand of hard drive
Answer to: No sound, why is my computer telling me to plug in speakers?Check your device manager by right clicking 'my computer' if there is a yellow exclamation next to audio devices, you need an updated driver. Go to the manufacturer's website support page, enter your model and look for sound drivers section. Download the one for your laptop, then install It, and it should fix your problem. If this doesn't fix your sound problem, most likely the internal speakers on this laptop is defective.