I was given this laptop after it went through a car accident and had liquid spilled in it. I replaced the motherboard, memory, keyboard, and lcd. I got it up and running, but kept shutting down after making it to the desktop. I replace the coolant fan and heat sink after a tech told me that it was over heating, and set the system settings back to default. It ran good for about a month, and is now doing the same thing. Another tech told me that this was a problem with the Acer Aspire 3500, and the hard drive controller was bad, but to replace it, you had to replace the motherboard. Can the hard drive controller be replace in the 9500 series, or can the controller itself be replaced. Or, do you think there could be another problem. The only thing that hasn't been replaced is the hard drive. Any help would be appreciated.